RISK FACTORS

Investing in our common stock involves a high degree of risk. Before deciding to invest in our common stock, you should carefully consider each of the following risk factors and all other information set forth in this prospectus and any related free writing prospectus. The following risks and the risks described elsewhere in this prospectus, including in the section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” could materially harm our business, financial condition, operating results, cash flow and prospects. If that occurs, the trading price of our common stock could decline, and you may lose all or part of your investment.

Risks Related to Our Business

Internet radio is an emerging market, which makes it difficult to evaluate our current business and future prospects.

Internet radio is an emerging market and our current business and future prospects are difficult to evaluate. The market for internet radio has undergone rapid and dramatic changes in its relatively short history and is subject to significant challenges. As a result, the future revenue and income potential of our business is uncertain. You should consider our business and prospects in light of the risks and difficulties we encounter in this new and rapidly evolving market, which risks and difficulties include, among others:

Failure to successfully address these risks and difficulties, and other challenges associated with operating in a new and emerging market, could inhibit the implementation of our business plan, significantly harm our financial condition, operating results and liquidity and prevent us from achieving or sustaining profitability.

We have incurred significant operating losses in the past and may not be able to generate sufficient revenue to be profitable.

Since our inception in 2000, we have incurred significant net operating losses and as of April 30, 2011, we had an accumulated deficit of $92.1 million. A key element of our strategy is to increase the number of listeners and listener hours to increase our market penetration. However, as our number of listener hours increases, the royalties we pay for content acquisition also increase. We have not in the past generated, and may not in the future generate, sufficient revenue from the sale of advertising and subscriptions to offset such royalty expenses. If we cannot successfully earn revenue at a rate that exceeds the operational costs associated with increased listener hours, we may not be able to achieve or sustain profitability. In addition, we expect to invest heavily in our operations to support anticipated future growth and public company reporting and compliance obligations. As a result of these factors, we expect to continue to incur operating losses on an annual basis through at least fiscal 2012.

Our revenue increased rapidly in each of the fiscal years ended January 31, 2007 through January 31, 2011; however, we expect our revenue growth rate to decline in the future as a result of a variety of factors, including

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increased competition and the maturation of our business, and we cannot assure you that our revenue will continue to grow or will not decline. You should not consider our historical revenue growth or operating expenses as indicative of our future performance. If our revenue growth rate declines or our operating expenses exceed our expectations, our financial performance will be adversely affected. Further, if our future growth and operating performance fail to meet investor or analyst expectations, it could have a materially negative effect on our stock price.

In addition, in our efforts to increase revenue as the number of listener hours has grown, we have expanded and expect to continue to expand our sales force. If our hiring of additional sales personnel does not result in a sufficient increase in revenue, the cost of this additional headcount will not be offset, which would harm our operating results and financial condition.

Our failure to convince advertisers of the benefits of our service in the future could harm our business.

For our fiscal year ended January 31, 2011 and the three months ended April 30, 2011, we derived 86.6% and 85.5%, respectively, of our revenue from the sale of advertising and expect to continue to derive a substantial majority of our revenue from the sale of advertising in the future. Our ability to attract and retain advertisers, and ultimately to generate advertising revenue, depends on a number of factors, including:

Our agreements with advertisers are generally short term or may be terminated at any time by the advertiser. Advertisers are spending only a small amount of their overall advertising budget on our service, may view advertising with us as experimental and unproven and may leave us for competing alternatives at any time. We may never succeed in capturing a greater share of our advertisers’ core advertising spending, particularly if we are unable to achieve the scale and market penetration necessary to demonstrate the effectiveness of our advertising platforms, or if our advertising model proves ineffective or not competitive when compared to alternatives. Failure to demonstrate the value of our service would result in reduced spending by, or loss of, existing or potential future advertisers, which would materially harm our revenue and business.

Advertising on mobile devices, such as smartphones, is an emerging phenomenon, and if we are unable to increase revenue from our advertising products delivered to mobile devices, our results of operations will be materially adversely affected.

Our number of listener hours on mobile devices has surpassed listener hours on traditional computers, and we expect that this trend will continue. Our mobile listenership has experienced significant growth since we introduced the first mobile version of our service in May 2007. Listener hours on mobile devices constituted approximately 4.6%, 23.5%, 50.5% and 60.3% of our total listener hours for fiscal years 2009, 2010 and 2011 and the three months ended April 30, 2011, respectively. We expect this growth to continue, though at a less rapid pace. Advertising on mobile devices is an emerging phenomenon, and the percentage of advertising spending allocated to advertising on mobile devices is lower than online advertising. According to IDC, the percentage of U.S. advertising spending allocated to advertising on mobile devices was less than 1% in 2010, compared to 13% for all online advertising. Our cost of content acquisition is currently calculated on the same

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basis whether a listening hour is consumed on a traditional computer or a mobile device. To date, we have not been able to generate revenue from our advertising products delivered to mobile devices as effectively as we have for our advertising products served on traditional computers. While a substantial amount of our revenue has been derived from display ads, some display ads may not be currently optimized for use on certain mobile devices. For example, display ads are not well-suited for use on smartphones due to the size of the device screen and may not be appropriate for automobiles due to safety considerations. Further, some display ads may not be optimized to take advantage of the multimedia capabilities of connected devices. By contrast, audio ads are better-suited for delivery in automobiles and across mobile and connected device platforms and video ads can be optimized for a variety of platforms. Our audio and video advertising products are relatively new and have not been as widely accepted by advertisers as our traditional display ads. In addition, the introduction of audio advertising places us in more direct competition with terrestrial radio, as many advertisers that purchase audio ads focus their spending on terrestrial radio stations. One challenge we face in promoting audio ads is thus overcoming any reluctance of these advertisers to migrate their advertising spend to online advertising. We have plans to increase our number of listener hours on mobile and other connected devices, including our efforts to expand the reach of our service by making it available on an increasing number of such devices, such as smartphones and devices connected to or installed in automobiles, and we cannot assure you that we will be able to effectively monetize inventory generated by listeners using mobile and connected devices, or the time frame on which we may do so.

Unavailability of, or fluctuations in, third-party measurements of our audience may adversely affect our ability to grow advertising revenue.

Selling ads requires that we demonstrate to advertisers that our service has substantial reach, and we rely on third parties to quantify the reach of our service. These third-party ratings may not reflect our true listening audience and the third parties may change their methodologies. Third-party independent rating agencies have not yet developed rating systems that comprehensively and accurately measure the reach of our service, especially on mobile and consumer electronic devices. We expect that in the future these rating agencies will begin to publish increasingly reliable information about the reach of our service. However, until then, in order to demonstrate to potential advertisers the reach of our service, we must supplement third-party ratings data with our internal research, which is perceived as less reliable than third-party numbers. If our mobile audience becomes rated, it is not clear whether the measurement technology of the third-party rating agencies will initially integrate with ours or whether their methodology will accurately reflect the value of our service. If such third-party ratings are inaccurate or we receive low ratings, our ability to convince advertisers of the benefits of our service would be adversely affected.

Our success depends upon the continued acceptance of online advertising as an alternative or supplement to offline advertising.

The percentage of the advertising market allocated to online advertising lags the percentage of time spent by people consuming media online by a significant degree. Growth of our business will depend in large part on the reduction or elimination of this gap between online and offline advertising spending, which may not happen in a way or to the extent that we currently expect. Many advertisers still have limited experience with online advertising and may continue to devote significant portions of their advertising budgets to traditional, offline advertising media. Accordingly, we continue to compete for advertising dollars with traditional media, including broadcast radio.

Although advertisers as a whole are spending an increasing amount of their overall advertising budget on online advertising, we face a number of challenges in growing our advertising revenue. We compete for advertising dollars with significantly larger and more established online marketing and media companies such as Facebook, Google, MSN and Yahoo!. We believe that the continued growth and acceptance of our online advertising products will depend on the perceived effectiveness and the acceptance of online advertising models generally, which is outside of our control. Any lack of growth in the market for online advertising could result in reduced revenue or increased marketing expenses, which would harm our operating results and financial condition.

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If our efforts to attract prospective listeners and to retain existing listeners are not successful, our growth prospects and revenue will be adversely affected.

Our ability to grow our business and generate advertising revenue depends on retaining and expanding our listener base and increasing listener hours. We must convince prospective listeners of the benefits of our service and existing listeners of the continuing value of our service. The more listener hours we stream, the more ad inventory we have to sell. Further, growth in our listener base increases the size of demographic pools targeted by advertisers, which improves our ability to deliver advertising in a manner that maximizes our advertising customers’ return on investment and, ultimately, to demonstrate the effectiveness of our advertising solutions and justify a pricing structure that is profitable for us. If we fail to grow our listener base and listener hours particularly in key demographics such as young adults, we will be unable to grow advertising revenue, and our business will be materially and adversely affected.

Our ability to increase the number of our listeners and listener hours will depend on effectively addressing a number of challenges and we may fail to do so. Some of these challenges include:

In addition, we have historically relied heavily on the success of viral marketing to expand consumer awareness of our service. If we are unable to maintain or increase the efficacy of our viral marketing strategy, or if we otherwise decide to expand the reach of our marketing through use of more costly marketing campaigns, we will experience an increase in marketing expenses, which could have an adverse effect on our results of operations. We cannot assure you that we will be successful in maintaining or expanding our listener base and failure to do so would materially reduce our revenue and adversely affect our business, operating results and financial condition.

Further, although we use our number of registered users and our number of active users as indicators of our brand awareness and the growth of our business, the number of registered users and number of active users exceeds the number of unique individuals who register for, or actively use, our service for a number of reasons. We define registered users as the total number of accounts that have been created for our service and we define active users as the number of distinct registered users that have requested audio from our servers within the trailing 30 days from the end of each calendar month. To establish an account, a person must provide an email address and a user name, but no personally unique information and a person may have multiple accounts. If the number of actual listeners does not result in an increase in listener hours, then our business may not grow as quickly as we expect, which may harm our business, operating results and financial condition.

We face and will continue to face competition for both listener hours and advertising spending.

We compete with other content providers for listener hours.

We compete for the time and attention of our listeners with other content providers on the basis of a number of factors, including quality of experience, relevance, acceptance and diversity of content, ease of use, price, accessibility, perception of ad load and brand awareness and reputation.

Our competitors include terrestrial radio providers such as CBS and Clear Channel, satellite radio providers such as Sirius XM, online radio providers such as iheartradio, Last.fm and Slacker Personal Radio, subscription online on-demand music providers such as RDIO and Rhapsody and potential U.S. market entrants like Spotify. Terrestrial radio providers offer their content for free, are well-established and accessible to listeners and offer content, such as news, sports, traffic, weather and talk, that we currently do not. In addition, many terrestrial radio stations have begun broadcasting digital signals, which provide high quality audio transmission. Satellite

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radio providers offer extensive and oftentimes exclusive news, comedy, sports and talk content, national signal coverage, and long established automobile integration. Select online providers offer more extensive content libraries and can be accessed internationally, while online on-demand services give listeners total control to choose their content.

We also compete more broadly with providers of alternative forms of audio media and entertainment, which are purchased or available for free and playable on mobile devices, automobiles and in the home, such as iTunes audio files, MP3s, CDs, and other forms of pre-recorded audio, as well as content streams from other online services such as Hulu, VEVO and YouTube. We face increasing competition for listeners from a growing variety of businesses that deliver audio media content through mobile phones and other wireless devices, such as iTunes.

We believe that companies with a combination of financial resources, technical expertise and digital media experience also pose a significant threat of developing competing internet radio and digital audio entertainment technologies in the future. In particular, if known incumbents in the digital media space such as Amazon, Apple, Facebook or Google choose to offer competing services, they may devote greater resources than we have available, have a more accelerated time frame for deployment and leverage their existing user base and proprietary technologies to provide products and services that our listeners and advertisers may view as superior. Our current and future competitors may have more well-established brand recognition, more established relationships with consumer product manufacturers, greater financial, technical, and other resources, more sophisticated technologies or more experience in the markets in which we compete.

We also compete for listeners on the basis of our presence and visibility as compared with other businesses and software that deliver audio and other content through the internet, mobile devices and consumer products. We face significant competition for listeners from companies promoting their own digital music and content online or through application stores, including several large, well-funded and seasoned participants in the digital media market. Search engines, such as Google, and mobile device application stores, such as the iTunes Store, rank responses to search queries based on the popularity of a website or mobile application, as well as other factors that are outside of our control. Additionally, mobile device application stores often offer users the ability to browse applications by various criteria, such as the number of downloads in a given time period, the length of time since a mobile app was released or updated, or the category in which the application is placed. The websites and mobile applications of our competitors may rank higher than our website and our Pandora app, and our app may be difficult to locate in mobile device application stores, which could draw potential listeners away from our service and toward those of our competitors. In addition, our competitors’ products may be pre-loaded into consumer electronics products or automobiles, creating an initial visibility advantage. If we are unable to compete successfully for listeners against other digital media providers by maintaining and increasing our presence and visibility online, in application stores and in consumer electronics products and automobiles, our listener hours may fail to increase as expected or decline and our advertising sales will suffer.

To compete effectively, we must continue to invest significant resources in the development of our service to enhance the user experience of our listeners. There can be no assurance that we will be able to compete successfully for listeners in the future against existing or new competitors, and failure to do so could result in loss of existing or potential listeners, reduced revenue, increased marketing expenses or diminished brand strength, any of which could harm our business.

We compete for advertising spending with other content providers.

We compete for a share of advertisers’ overall marketing budgets with other content providers on a variety of factors including perceived return on investment, effectiveness and relevance of our advertising products, pricing structure and ability to deliver large volumes or precise types of ads to targeted demographics.

We face significant competition for advertising dollars from terrestrial and, to a lesser extent, satellite radio providers. As many of the advertisers we target have traditionally advertised on terrestrial radio and have less experience with internet radio providers, they may be reluctant to spend for advertising on traditional computers,

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mobile or other connected device platforms. In addition, terrestrial radio providers as well as other traditional media companies in television and print, such as broadcast television networks such as ABC, CBS, FOX and NBC, cable television channel providers, national newspapers such as the New York Times and the Wall Street Journal and some regional newspapers, enjoy a number of competitive advantages over us in attracting advertisers, including large established audiences, longer operating histories, greater brand recognition and a growing presence on the internet.

Although advertisers are allocating an increasing amount of their overall marketing budgets to web and mobile-based ads, such spending lags behind growth in internet usage, and the market for online and mobile advertising is intensely competitive. As a result, we also compete for advertisers with a range of internet companies, including major internet portals, search engine companies and social media sites. Large internet companies with greater brand recognition, such as Facebook, Google, MSN and Yahoo! have significant numbers of direct sales personnel and substantial proprietary advertising inventory and web traffic that provide a significant competitive advantage and have a significant impact on pricing for internet advertising and web traffic. The trend toward consolidation among online marketing and media companies may also affect pricing and availability of advertising inventory.

In order to compete successfully for advertisers against new and existing competitors, we must continue to invest resources in developing and diversifying our advertisement platform, harnessing listener data and ultimately proving the effectiveness and relevance of our advertising products. Failure to compete successfully against our current or future competitors could result in loss of current or potential advertisers or a reduced share of our advertisers’ overall marketing budget, which could adversely affect our pricing and margins, lower our revenue, increase our research and development and marketing expenses and prevent us from achieving or maintaining profitability.

We operate under statutory licensing structures for the reproduction and public performance of sound recordings that could change or cease to exist, which would adversely affect our business.

We currently operate under statutory licensing regimes and structures that may change or cease to exist. Unlike traditional radio broadcasters, we must pay performance rights royalties for the digital audio transmission of sound recordings pursuant to the Digital Performance Right in Sound Recordings Act and Digital Millennium Copyright Act. Subject to our ongoing compliance with numerous statutory conditions and regulatory requirements for a non-interactive service, we are permitted to operate under a statutory license that allows the streaming in the U.S. of any sound recording lawfully released to the public. We are also permitted to make reproductions of sound recordings on computer servers pursuant to a separate statutory license designed to facilitate the making of transmissions. There is no guarantee that we will continue to be eligible to operate under these statutory licenses. For example, if a court were to determine that we operate an interactive streaming service or make reproductions of sound recordings outside the statutory license, we would have to negotiate license agreements with sound recording copyright owners individually, a time consuming and expensive undertaking that would jeopardize our ability to stream all music currently in our library and could result in royalty costs that are prohibitively expensive. In addition, if copyright owners object to the functionality or transmission methods of our service, we could lose our eligibility to operate under the statutory licenses. Our ability to avoid negotiating separate agreements with the many copyright owners of sound recordings depends on these two statutory licenses, and if we were to no longer qualify for operation under, or violate the provisions of the statutory licenses, we could be subject to significant liability for copyright infringement and may no longer be able to operate under our existing licensing regime. For our fiscal year ended January 31, 2011 and the three months ended April 30, 2011, we incurred SoundExchange related content acquisition costs representing 45% and 53%, respectively, of our total revenue for those periods.

The rates to be paid for the streaming of sound recordings pursuant to the statutory licenses can be established by either negotiation or through a rate proceeding conducted by the Copyright Royalty Board, or CRB, a tribunal established within the U.S. Library of Congress. In 2007, the CRB set royalty rates for the online streaming of sound recordings for 2006 through 2010 that were so high that the cost for streaming sound

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recordings alone would have been unsustainable under our current business model. In response to the lobbying efforts of internet webcasters, including us, Congress passed the Webcaster Settlement Acts of 2008 and 2009, which permitted webcasters and SoundExchange, the sole entity designated by the CRB to collect and distribute the statutory royalties paid by internet webcasters such as us, to negotiate alternative rates to those established by the CRB for the years 2006 through 2015. In July 2009, certain webcasters reached an agreement with SoundExchange, establishing a more favorable royalty structure that we have elected to accept and that by its terms will apply through 2015. We do not know what rates will be available to us following that period and there is no guarantee that the royalty structure that emerged from the negotiations with SoundExchange pursuant to the Webcaster Settlement Acts will be available after 2015. The CRB, which still has rate-making authority over us upon expiration of our agreement with SoundExchange, has consistently established royalty rates that would, if paid by us, consume an unsustainable percentage of our revenue. If we are unable to reach a new agreement with SoundExchange for the period after 2015, our operating costs may significantly increase, which could harm our financial condition and inhibit the implementation of our business plan.

We depend upon third-party licenses for musical works and a change to or loss of these licenses could increase our operating costs or adversely affect our ability to retain and expand our listener base, and therefore could adversely affect our business.

To secure the rights to stream musical works embodied in sound recordings over the internet, we obtain licenses from or for the benefit of copyright owners and pay royalties to copyright owners or their agents. Those who own copyrights in musical works are vigilant in protecting their rights and seek royalties that are very high in relation to the revenue that can be generated from the public performance of such works. There is no guarantee that the licenses available to us now will continue to be available in the future or that such licenses will be available at the royalty rates associated with the current licenses. If we are unable to secure and maintain rights to stream musical works or if we cannot do so on terms that are acceptable to us, our ability to stream music content to our listeners, and consequently our ability to attract and retain advertisers, will be adversely impacted.

In order to stream musical works embodied in sound recordings over the internet, we must obtain public performance licenses and pay license fees to three performing rights organizations: Broadcast Music, Inc., or BMI, SESAC, Inc., or SESAC, and the American Society of Composers, Authors and Publishers, or ASCAP. These organizations represent the rights of songwriters and music publishers, negotiate with copyright users such as us, collect royalties and distribute those royalties to the copyright owners they represent, namely songwriters and music publishers. Performing rights organizations have the right to audit our playlists and royalty payments, and any such audit could result in disputes over whether we have paid the proper royalties. If such a dispute were to occur, we could be required to pay additional royalties and the amounts involved could be material. We currently operate under negotiated agreements with BMI and SESAC, however, these agreements are subject to termination by either party in accordance with their terms at the end of each calendar year, with respect to BMI, and at the end of each yearly term, with respect to SESAC, and there is no guarantee that the associated royalty rates available to us now will be available to us in the future. BMI, pursuant to a consent decree entered into with the U.S. Department of Justice, cannot refuse to grant us licenses for the public performance of musical works represented by BMI but the rates to be paid to BMI can be set, in the absence of a negotiated agreement, by the rate court established pursuant to such decree in the U.S. District Court for the Southern District of New York. SESAC is not subject to a mandatory licensing obligation and could withhold the rights to all of the musical works for which it acts as a licensor on behalf of songwriters and music publishers. The loss of the musical works represented by SESAC could diminish the appeal of our service to listeners.

In October 2010, we elected to terminate our prior agreement with ASCAP as of December 31, 2010 because we believe that royalty rates currently sought by ASCAP are excessive. Notwithstanding our termination of the agreement, musical works administered by ASCAP are licensed to us pursuant to the provisions of a consent decree, similar to the BMI consent decree referred to above. The ASCAP consent decree also established a rate court in the U.S. District Court for the Southern District of New York. The rates to be paid by us will be set either by mutual agreement between us and ASCAP, or by a ruling from the ASCAP rate court. Pending a final

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determination of new rates, we will account to ASCAP on an interim basis at reasonable royalty rates to be established either by mutual agreement or by the ASCAP rate court. If either we or ASCAP request that the rate court determine our royalty rate, rate court proceedings can take years to complete and be very costly. In such a case, there is no guarantee that the rate court will establish royalty rates more favorable to us than those we previously paid pursuant to our license agreement with ASCAP, and we could be liable for both increased royalty rates going forward and a potential true-up of royalty payments in excess of any interim royalties paid for the period following December 31, 2010. For our fiscal year ended January 31, 2011 and the three months ended April 30, 2011, we incurred BMI, SESAC and ASCAP related content acquisition costs representing 4% and 4%, respectively, of our total revenue for those periods.

We do not currently pay so-called “mechanical royalties” to music publishers for the reproduction and distribution of musical works embodied in transitory copies used to make streams audible to our listeners. Although not currently a matter of dispute, if music publishers were to change their position and seek to be paid mechanical royalties by us, and a final judgment were entered by a court requiring that payment, our royalty obligations could increase significantly, which would increase our operating expenses and harm our business and financial interests.

In May 2011, we started streaming spoken word comedy content, for which the underlying literary works are not currently entitled to eligibility for licensing by any performing rights organization for the United States. While pursuant to industry-wide custom and practice, this content is performed absent a specific license from any such performing rights organization, there can be no assurance that this will not change or that we will not otherwise become subject to additional licensing costs for spoken word comedy content imposed by performing rights organizations in the future.

If music publishers withdraw all or a portion of their catalogs from performing rights organizations such as ASCAP or BMI, we may be forced to enter into direct licensing agreements with these publishers at rates higher than those we currently pay, or may be unable to reach agreement with these publishers at all, which could adversely affect our business, financial condition and results of operations.

In May 2011, EMI Music Publishing, or EMI, announced its decision to withdraw certain licensing rights from ASCAP that EMI had previously authorized ASCAP to manage on its behalf. As a result, ASCAP may no longer be able to license the webcasting of songs from EMI’s catalog of musical compositions, and digital music webcasters, such as Pandora, who were previously able to secure licenses from ASCAP for EMI musical compositions may now have to enter into direct licensing arrangements with EMI. Although we continue to be licensed by ASCAP, it is currently unclear what specific effect EMI’s limited withdrawal from ASCAP will have on us, or whether other publishers may also choose to withdraw all or a portion of their catalogs from the collection of musical compositions that ASCAP has the authority to license. If we are unable to reach an agreement with respect to the repertoire of EMI or any other music publisher who withdraws all or a portion of its catalog(s) from ASCAP or other performing rights organizations, or if we are forced to enter into direct licensing agreements with publishers at rates higher than those currently set by the performing rights organizations (or the U.S. District Court having supervisory authority over ASCAP and BMI) for the performance of musical works, our ability to stream music content to our listeners may be limited or our operating costs may significantly increase, which could adversely affect our business, financial condition and results of operations.

If we fail to accurately predict and play music or comedy content that our listeners enjoy, we may fail to retain existing and attract new listeners.

We believe that a key differentiating factor between the Pandora service and other music content providers is our ability to predict music that our listeners will enjoy. Our personalized playlist generating system, based on the Music Genome Project and our proprietary algorithms, is designed to enable us to predict listener music preferences and select music content tailored to our listeners’ individual music tastes. We have invested, and will

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continue to invest, significant resources in refining these technologies; however, we cannot assure you that such investments will yield an attractive return or that such refinements will be effective. The effectiveness of our personalized playlist generating system depends in part on our ability to gather and effectively analyze large amounts of listener data and listener feedback and we have no assurance that we will continue to be successful in enticing listeners to give a thumbs-up or thumbs-down to enough songs for our database to effectively predict and select new and existing songs. In addition, our ability to offer listeners songs that they have not previously heard and impart a sense of discovery depends on our ability to acquire and appropriately categorize additional songs that will appeal to our listeners’ diverse and changing tastes. While we have more than 800,000 songs in our catalog, we must continuously identify and analyze additional songs that our listeners will enjoy and we may not effectively do so. We recently launched comedy on the Pandora service, which are designed to predict comedy content that our listeners will enjoy using technology similar to the technology that we use to generate personalized playlists for music. The risks that apply to predicting our listeners’ musical tastes apply to comedy to an even greater extent, particularly as we lack experience with content other than music, do not yet have a large set of data on listener preferences for comedy and have a much smaller comedy catalog as compared to music. Our ability to predict and select music or comedy content that our listeners enjoy is critical to the perceived value of our service among listeners and failure to make accurate predictions would adversely affect our ability to attract and retain listeners, increase listener hours and sell advertising.

Our ability to increase the number of our listeners will depend in part on our ability to establish and maintain relationships with automakers, automotive suppliers and consumer electronics manufacturers and consumer acceptance of the products that integrate our service.

A key element of our strategy to expand the reach of our service and increase the number of our listeners and listener hours is to establish and maintain relationships with automakers, automotive suppliers and consumer electronics manufacturers that integrate our service into and with their products. Working with certain third-party distribution partners, we currently offer listeners the ability to access our service through a variety of consumer electronics products used in the home and devices connected to or installed in automobiles. We intend to broaden our ability to reach additional listeners, and increase current listeners hours, through other platforms and partners over time. However, reaching agreements with distribution partners can be time consuming, and once an agreement is reached, product design cycles can be lengthy. If we are not successful in maintaining existing and creating new relationships, or if we encounter technological, content licensing or other impediments, our ability to grow our business could be adversely impacted.

Our existing agreements with partners in the automobile industry generally do not obligate an automobile manufacturer to launch the integration of our service in its automobiles. In addition, some automobile manufacturers or their supplier partners may terminate their agreements with us for convenience. Our business could be adversely affected if our automobile partners and consumer electronics partners do not continue to provide access to our service or are unwilling to do so on terms acceptable to us. If we are forced to amend the business terms of our distribution agreements as a result of competitive pressure, our ability to maintain and expand the reach of our service and increase listener hours would be adversely affected, which would reduce our revenue and harm our operating results.

Additionally, we distribute our mobile applications via smartphone application download stores managed by Apple, Google, Palm and Research In Motion, or RIM, and such distribution is subject to an application developer license agreement in each case. Should any of these parties amend the terms of their license in such a way that inhibits our ability to distribute the Pandora apps via their application store, or negatively impacts our economics in such distribution, our ability to increase listener hours and sell advertising would be adversely affected, which would reduce our revenue and harm our operating results.

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Loss of agreements with the makers of mobile devices, renegotiation of such agreements on less favorable terms or other actions these third parties may take could harm our business.

Most of our agreements with makers of mobile operating systems and devices through which our service may be accessed, including Apple, RIM and Google, are short term or can be cancelled at any time with little or no prior notice or penalty. The loss of these agreements, or the renegotiation of these agreements on less favorable economic or other terms, could limit the reach of our service and its attractiveness to advertisers. Some of these mobile device makers, including Apple, are now, or may in the future become, competitors of ours, and could stop allowing or supporting access to our service through their products for competitive reasons. Furthermore, because devices providing access to our service are not manufactured and sold by us, we cannot guarantee that these companies will ensure that their devices perform reliably, and any faulty connection between these devices and our service may result in consumer dissatisfaction toward us, which could damage our brand.

If we are unable to continue to make our technology compatible with the technologies of third-party distribution partners who make our service available to our listeners through mobile devices, consumer electronic products and automobiles, we may not remain competitive and our business may fail to grow or decline.

In order to deliver music everywhere our listeners want to hear it, we need our service to be compatible with mobile, consumer electronic, automobile and website technologies. Our service is accessible in part through Pandora-developed or third-party developed applications that hardware manufacturers embed in, and distribute through, their devices. Connected devices and their underlying technology are constantly evolving. As internet connectivity of automobiles, mobile devices, and other consumer electronic products expands and as new internet-connected products are introduced, we must constantly adapt our technology. It is difficult to keep pace with the continual release of new devices and technological advances in digital media delivery and predict the problems we may encounter in developing versions of our applications for these new devices and delivery channels, and it may become increasingly challenging to do so in the future. In particular, the technology used for streaming the Pandora service in automobiles remains at an early stage and may not result in a seamless customer experience. If automobile and consumer electronic makers fail to make products that are compatible with our technology or we fail to adapt our technology to evolving requirements, our ability to grow or sustain the reach of our service, increase listener hours and sell advertising could be adversely affected.

Furthermore, consumer tastes and preferences can change in rapid and unpredictable ways and consumer acceptance of these products depends on the marketing, technical and other efforts of third-party manufacturers, which is beyond our control. If consumers fail to accept the products of the companies with whom we partner or if we fail to establish relationships with makers of leading consumer products, our business could be adversely affected.

We rely upon an agreement with DoubleClick, which is owned by Google, for delivering and monitoring our ads. Failure to renew the agreement on favorable terms, or termination of the agreement, could adversely affect our business.

We use DoubleClick’s ad-serving platform to deliver and monitor ads for our service. There can be no assurance that our agreement with DoubleClick, which is owned by Google, will be extended or renewed upon expiration, that we will be able to extend or renew our agreement with DoubleClick on terms and conditions favorable to us or that we could identify another alternative vendor to take its place. Our agreement with DoubleClick also allows DoubleClick to terminate our relationship before the expiration of the agreement on the occurrence of certain events, including if DoubleClick determines that our use of its service could damage or cause injury to DoubleClick or reflect unfavorably on DoubleClick’s reputation.

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Our independent registered public accounting firm has advised us that it has identified a material weakness in our internal control over financial reporting relating to inadequate financial statement preparation and review procedures.

In connection with the audit of our financial statements as of and for the year ended January 31, 2011 our independent registered public accounting firm reported to our audit committee that it had identified a material weakness in internal control over financial reporting related to inadequate financial statement preparation and review procedures. Under standards established by the Public Company Accounting Oversight Board, a material weakness is a deficiency, or combination of deficiencies in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected and corrected on a timely basis. Specifically, our independent registered public accounting firm determined that we did not have adequate procedures and controls to ensure that accurate financial statements could be prepared on a timely basis, including insufficient review of account reconciliations that did not identify exceptions or that required journal entries.

As a result of this material weakness, our auditors recommend that we:

We concurred with the findings of our independent registered public accounting firm. We are working to remediate the material weakness. We have begun taking numerous steps and plan to take additional steps to remediate the underlying causes of the material weakness, primarily through the development and implementation of formal policies, improved processes and documented procedures, as well as the hiring of additional accounting and finance personnel. The actions that we are taking are subject to ongoing senior management review, as well as audit committee oversight. Although we plan to complete this remediation process as quickly as possible, we cannot at this time estimate how long it will take, and our initiatives may not prove to be successful in remediating this material weakness. If we are unable to successfully remediate this material weakness and if we are unable to produce accurate and timely financial statements, our stock price may be adversely affected and we may be unable to maintain compliance with applicable stock exchange listing requirements.

In addition, we will need to evaluate our internal controls over financial reporting in connection with Section 404 of the Sarbanes Oxley Act for fiscal 2012, and our auditors will be required to attest to our internal controls over financial reporting starting with our annual report for fiscal 2013. This assessment will need to include disclosure of any material weaknesses in our internal control over financial reporting identified by our management, as well as our auditors’ attestation report on our internal controls over financial reporting. We are just beginning the costly and challenging process of compiling the system and processing documentation needed to comply with such requirements. We may not be able to complete our evaluation, testing and any required remediation in a timely fashion. During the evaluation and testing processes, if we identify one or more material weaknesses in our internal control over financial reporting, we will be unable to assert that our internal control over financial reporting is effective. If we are unable to assert that our internal control over financial reporting is effective, or if our auditors are unable to express an opinion on the effectiveness of our internal control over financial reporting, we could lose investor confidence in the accuracy and completeness of our financial reports, which could have a material adverse effect on the price of our common stock.

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Our business and prospects depend on the strength of our brand and failure to maintain and enhance our brand would harm our ability to expand our base of listeners, advertisers and other partners.

Maintaining and enhancing the “Pandora” brand is critical to expanding our base of listeners, advertisers and other partners. Maintaining and enhancing our brand will depend largely on our ability to continue to develop and provide an innovative and high quality experience for our listeners and attract advertisers, content owners and automobile, mobile device, and other consumer electronic product manufacturers to work with us, which we may not do successfully.

Our brand may be impaired by a number of other factors, including service outages, data privacy and security issues, listener perception of ad load and exploitation of our trademarks by others without permission. Further, if our partners fail to maintain high standards for products that integrate our service, fail to display our trademarks on their products in breach of our agreements with them, or use our trademarks incorrectly or in an unauthorized manner or if we partner with manufacturers of products that our listeners reject, the strength of our brand could be adversely affected. In addition, there is a risk that the word “Pandora” could become so commonly used that we lose protection for this trademark, which could result in other people using the word “Pandora” to refer to their own products, thus diminishing the strength of our brand.

We have not historically been required to spend considerable resources to establish and maintain our brand. However, if we are unable to maintain the growth rate in the number of our listeners, we may be required to expend greater resources on advertising, marketing, and other brand-building efforts to preserve and enhance consumer awareness of our brand which would adversely affect our operating results and may not be effective.

We have experienced rapid growth in recent periods. If we fail to effectively manage our growth, our business and operating results may suffer.

We have recently experienced, and expect to continue to experience, rapid growth which has placed, and will continue to place, significant demands on our management and our operational and financial infrastructure. We expect that our growth strategy will require us to commit substantial financial, operational and technical resources. In order to attain and maintain profitability, we will need to recruit, integrate and retain skilled and experienced sales personnel who can demonstrate our value proposition to advertisers and increase the monetization of listener hours, particularly on mobile devices. Continued growth could also strain our ability to maintain reliable service levels for our listeners, effectively monetize our listener hours, develop and improve our operational, financial and management controls, enhance our reporting systems and procedures and recruit, train and retain highly skilled personnel. If our systems do not evolve to meet the increased demands placed on us by an increasing number of advertisers, we may also be unable to meet our obligations under advertising agreements with respect to the timing of our delivery of advertising or other performance obligations. As our operations grow in size, scope and complexity, we will need to improve and upgrade our systems and infrastructure, which will require significant expenditures and allocation of valuable management resources. If we fail to maintain the necessary level of discipline and efficiency and allocate limited resources effectively in our organization as it grows, our business, operating results and financial condition will suffer.

We depend on key personnel to operate our business, and if we are unable to retain, attract and integrate qualified personnel, our ability to develop and successfully grow our business could be harmed.

We believe that our future success is highly dependent on the contributions of our executive officers as well as our ability to attract and retain highly skilled and experienced sales, technical and other personnel. All of our employees, including our executive officers, are free to terminate their employment relationship with us at any time, and their knowledge of our business and industry may be difficult to replace. Qualified individuals are in high demand, particularly in the digital media industry, and we may incur significant costs to attract them. In addition, competition for qualified personnel is particularly intense in the San Francisco Bay Area, where our headquarters are located. If we are unable to attract and retain our executive officers and key employees, we may not be able to

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achieve our strategic objectives, and our business could be harmed. In addition, we believe that our key executives have developed highly successful and effective working relationships. If one or more of these individuals leave, we may not be able to fully integrate new executives or replicate the current dynamic and working relationships that have developed among our executive officers and other key personnel, and our operations could suffer.

Interruptions or delays in service arising from our own systems or from our third-party vendors could impair the delivery of our service and harm our business.

We rely on systems housed in our own facilities and upon third-party vendors, including bandwidth providers and data center facilities located in California and Virginia, to enable listeners to receive our content in a dependable, timely, and efficient manner. We have experienced and expect to continue to experience periodic service interruptions and delays involving our own systems and those of our third-party vendors. We do not currently maintain a live fail-over capability that would allow us to switch our streaming operations from one facility to another in the event of a service outage. Both our own facilities and those of our third-party vendors are vulnerable to damage or interruption from earthquakes, floods, fires, power loss, telecommunications failures and similar events. They also are subject to break-ins, sabotage, intentional acts of vandalism, the failure of physical, administrative, and technical security measures, terrorist acts, natural disasters, human error, the financial insolvency of our third-party vendors and other unanticipated problems or events. The occurrence of any of these events could result in interruptions in our service and to unauthorized access to, or alteration of, the content and data contained on our systems and that these third-party vendors store and deliver on our behalf.

We exercise no control over our third-party vendors, which makes us vulnerable to any errors, interruptions, or delays in their operations. Any disruption in the services provided by these vendors could have significant adverse impacts on our business reputation, customer relations and operating results. Upon expiration or termination of any of our agreements with third-party vendors, we may not be able to replace the services provided to us in a timely manner or on terms and conditions, including service levels and cost, that are favorable to us, and a transition from one vendor to another vendor could subject us to operational delays and inefficiencies until the transition is complete.

Our operating results may fluctuate, which makes our results difficult to predict and could cause our results to fall short of expectations.

Our revenue and operating results could vary significantly from quarter to quarter and year to year because of a variety of factors, many of which are outside our control. As a result, comparing our operating results on a period to period basis may not be meaningful. In addition to other risk factors discussed in this “Risk Factors” section, factors that may contribute to the variability of our quarterly and annual results include:

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Seasonal variations in listener and advertising behavior may also cause fluctuations in our financial results. We expect to experience some effects of seasonal trends in listener behavior due to increased internet usage and sales of media-streaming devices during certain vacation and holiday periods. For example, we expect to experience increased usage during the fourth quarter of each calendar year due to the holiday season, and in the first quarter of each calendar year due to increased use of media-streaming devices received as gifts during the holiday season. We may also experience higher advertising sales during the fourth quarter of each calendar year due to greater advertiser demand during the holiday season. In addition, expenditures by advertisers tend to be cyclical and discretionary in nature, reflecting overall economic conditions, the economic prospects of specific advertisers or industries, budgeting constraints and buying patterns and a variety of other factors, many of which are outside our control. While we believe these seasonal trends have affected and will continue to affect our quarterly results, our trajectory of rapid growth may have overshadowed these effects to date. We believe that our business may become more seasonal in the future and that such seasonal variations in listener behavior may result in fluctuations in our financial results.

Failure to protect our intellectual property could substantially harm our business and operating results.

The success of our business depends on our ability to protect and enforce our trade secrets, trademarks, copyrights and patents and all of our other intellectual property rights, including our intellectual property rights underlying the Pandora service. We attempt to protect our intellectual property under trade secret, trademark, copyright and patent law, and through a combination of employee and third-party nondisclosure agreements, other contractual restrictions, and other methods. These afford only limited protection. Despite our efforts to protect our intellectual property rights and trade secrets, unauthorized parties may attempt to copy aspects of our song selection technology or obtain and use our trade secrets and other confidential information. Moreover, policing our intellectual property rights is difficult, costly and may not always be effective.

We have filed, and may in the future file, patent applications. It is possible, however, that these innovations may not be protectable. In addition, given the cost, effort, risks and downside of obtaining patent protection, including the requirement to ultimately disclose the invention to the public, we may choose not to seek patent protection for certain innovations. However, such patent protection could later prove to be important to our business. Furthermore, there is always the possibility that our patent applications may not issue as granted patents, that the scope of the protection gained will be insufficient or that an issued patent may be deemed invalid or unenforceable. We also cannot guarantee that any of our present or future patents or other intellectual property rights will not lapse or be invalidated, circumvented, challenged or abandoned, that our intellectual property rights will provide competitive advantages to us, that our ability to assert our intellectual property rights against potential competitors or to settle current or future disputes will not be limited by our relationships with third parties, that any of our pending or future patent applications will have the coverage originally sought, that our intellectual property rights will be enforced in jurisdictions where competition may be intense or where legal protection may be weak, or that we will not lose the ability to assert our intellectual property rights against or to license our technology to others and collect royalties or other payments.

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We have registered “Pandora,” “Music Genome Project” and other marks as trademarks in the United States. Nevertheless, competitors may adopt service names similar to ours, or purchase our trademarks and confusingly similar terms as keywords in internet search engine advertising programs, thereby impeding our ability to build brand identity and possibly leading to confusion among our listeners or advertising customers. In addition, there could be potential trade name or trademark infringement claims brought by owners of other registered trademarks or trademarks that incorporate variations of the term Pandora or our other trademarks. Any claims or customer confusion related to our trademarks could damage our reputation and brand and substantially harm our business and operating results.

We currently own the www.pandora.com internet domain name and various other related domain names. Domain names are generally regulated by internet regulatory bodies. If we lose the ability to use a domain name in a particular country, we would be forced either to incur significant additional expenses to market our solutions within that country or to elect not to sell solutions in that country. Either result could harm our business and operating results. The regulation of domain names in the United States and in foreign countries is subject to change. Regulatory bodies could establish additional top-level domains, appoint additional domain name registrars or modify the requirements for holding domain names. As a result, we may not be able to acquire or maintain the domain names that utilize our brand names in the United States or other countries in which we may conduct business in the future.

In order to protect our trade secrets and other confidential information, we rely in part on confidentiality agreements with our employees, consultants and third parties with whom we have relationships. These agreements may not effectively prevent disclosure of trade secrets and other confidential information and may not provide an adequate remedy in the event of misappropriation of trade secrets or any unauthorized disclosure of trade secrets and other confidential information. In addition, others may independently discover our trade secrets and confidential information, and in such cases we could not assert any trade secret rights against such parties. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our trade secret rights and related confidentiality and nondisclosure provisions, and failure to obtain or maintain trade secret protection, or our competitors’ obtainment of our trade secrets or independent development of unpatented technology similar to ours or competing technologies, could adversely affect our competitive business position.

Litigation or proceedings before the U.S. Patent and Trademark Office or other governmental authorities and administrative bodies in the United States and abroad may be necessary in the future to enforce our intellectual property rights, to protect our patent rights, trademarks, trade secrets and domain names and to determine the validity and scope of the proprietary rights of others. Our efforts to enforce or protect our proprietary rights may be ineffective and could result in substantial costs and diversion of resources and management time, each of which could substantially harm our operating results.

Assertions by third parties of infringement or other violation by us of their intellectual property rights could result in significant costs and substantially harm our business and operating results.

Internet, technology and media companies are frequently subject to litigation based on allegations of infringement, misappropriation or other violations of intellectual property rights. Some internet, technology and media companies, including some of our competitors, own large numbers of patents, copyrights, trademarks and trade secrets, which they may use to assert claims against us. Third parties have asserted, and may in the future assert, that we have infringed, misappropriated or otherwise violated their intellectual property rights, and as we face increasing competition, the possibility of intellectual property rights claims against us grows. For example, in April 2011, we were served with a complaint by Augme Technologies, Inc. alleging that we have infringed an Augme patent and seeking injunctive relief and monetary damages. Such litigation may involve patent holding companies or other adverse patent owners who have no relevant product revenue, and therefore our own issued and pending patents may provide little or no deterrence to these patent owners in bringing intellectual property rights claims against us. In addition, various federal and state laws and regulations govern the intellectual property rights associated with sound recordings and musical works. Existing laws and regulations are evolving

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and subject to different interpretations, and various federal and state legislative or regulatory bodies may expand current or enact new laws or regulations. We cannot assure you that we are not infringing or violating any third-party intellectual property rights.

We cannot predict whether assertions of third-party intellectual property rights or any infringement or misappropriation claims arising from such assertions will substantially harm our business and operating results. If we are forced to defend against any infringement or misappropriation claims, whether they are with or without merit, are settled out of court, or are determined in our favor, we may be required to expend significant time and financial resources on the defense of such claims. Furthermore, an adverse outcome of a dispute may require us to pay damages, potentially including treble damages and attorneys’ fees, if we are found to have willfully infringed a party’s intellectual property; cease making, licensing or using solutions that are alleged to infringe or misappropriate the intellectual property of others; expend additional development resources to redesign our solutions; enter into potentially unfavorable royalty or license agreements in order to obtain the right to use necessary technologies, content, or materials; and to indemnify our partners and other third parties. Royalty or licensing agreements, if required or desirable, may be unavailable on terms acceptable to us, or at all, and may require significant royalty payments and other expenditures. In addition, any lawsuits regarding intellectual property rights, regardless of their success, could be expensive to resolve and would divert the time and attention of our management and technical personnel.

We may require additional capital to pursue our business objectives and respond to business opportunities, challenges or unforeseen circumstances. If capital is not available to us, our business, operating results and financial condition may be harmed.

We may require additional capital to operate or expand our business. In addition, some of our current or future strategic initiatives, including entry into non-music content channels, such as comedy, or international markets, may require substantial additional capital resources before they begin to generate revenue. Additional funds may not be available when we need them, on terms that are acceptable to us, or at all. For example, our current credit facility contains restrictive covenants relating to our capital raising activities and other financial and operational matters, and any debt financing secured by us in the future could involve further restrictive covenants, which may make it more difficult for us to obtain additional capital and to pursue business opportunities. In addition, volatility in the credit markets may have an adverse effect on our ability to obtain debt financing. If we do not have funds available to enhance our solutions, maintain the competitiveness of our technology and pursue business opportunities, we may not be able to service our existing listeners, acquire new listeners or attract or retain advertising customers, each of which could inhibit the implementation of our business plan and materially harm our operating results.

We may acquire other companies or technologies, which could divert our management’s attention, result in additional dilution to our stockholders and otherwise disrupt our operations and harm our operating results.

We may in the future seek to acquire or invest in businesses, products or technologies that we believe could complement or expand our service, enhance our technical capabilities or otherwise offer growth opportunities. The pursuit of potential acquisitions may divert the attention of management and cause us to incur various expenses in identifying, investigating and pursuing suitable acquisitions, whether or not they are consummated.

In addition, we do not have any experience in acquiring other businesses. If we acquire additional businesses, we may not be able to integrate the acquired personnel, operations and technologies successfully, or effectively manage the combined business following the acquisition. We also may not achieve the anticipated benefits from the acquired business due to a number of factors, including:

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In addition, a significant portion of the purchase price of companies we acquire may be allocated to acquired goodwill and other intangible assets, which must be assessed for impairment at least annually. In the future, if our acquisitions do not yield expected returns, we may be required to take charges to our operating results based on this impairment assessment process.

Acquisitions could also result in dilutive issuances of equity securities or the incurrence of debt, which could adversely affect our operating results. In addition, if an acquired business fails to meet our expectations, our operating results, business and financial condition may suffer.

We face many risks associated with our long-term plan to expand our operations outside of the United States, including difficulties obtaining rights to stream music on favorable terms.

Expanding our operations into international markets is an element of our long-term strategy. However, offering our service outside of the United States involves numerous risks and challenges. Most importantly, while the Digital Performance Right in Sound Recordings Act and the Digital Millennium Copyright Act provide a statutory licensing regime for the streaming of sound recordings to listeners within the United States, there is no equivalent statutory licensing regime available outside of the United States, and the other licensing alternatives currently available are not commercially viable. Currently, the licensing terms offered by rights organizations and individual copyright owners in countries outside the United States are prohibitively expensive. Addressing licensing structure and royalty rate issues in the United States required us to make very substantial investments of time, capital and other resources, and our business could have failed if such investments had not succeeded. Addressing these issues in foreign jurisdictions may require a commensurate investment by us, and there can be no assurance that we would succeed or achieve any return on this investment.

In addition, international expansion would expose us to other risks such as:

Further, in jurisdictions where copyright protection has been insufficient to protect against widespread music piracy, achieving market acceptance of our service may prove difficult as we would need to convince listeners to stream our service when they could otherwise download the same music for free. As a result of these

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obstacles, we may find it impossible or prohibitively expensive to enter foreign markets, or entry into foreign markets could be delayed, which could hinder our ability to grow our business.

Expansion of our operations into non-music content, including our recent launch of comedy, subjects us to additional business, legal, financial and competitive risks.

Expansion of our operations into delivery of non-music content stations involves numerous risks and challenges, including increased capital requirements, new competitors and the need to develop new strategic relationships. For example, in May 2011, we started streaming spoken word comedy content, for which the underlying literary works are not currently entitled to eligibility for licensing by any performing rights organization for the United States. Rather, pursuant to industry-wide custom and practice, this content is performed absent a specific license from any such performing rights organization. Further, growth into this new area may require changes to our existing business model and cost structure, modifications to our infrastructure and exposure to new regulatory and legal risks, any of which may require expertise in which we have little or no experience. There is no guarantee that we will be able to generate sufficient revenue from advertising sales associated with comedy content to offset the costs of maintaining comedy stations. For example, many of the mainstream advertisers that choose to place ads on our music stations may choose not to advertise on our comedy stations because of the sometimes explicit nature of comedy content. Further, we have established a reputation as an online music provider and our ability to gain acceptance and listenership for comedy content stations, and thus our ability to attract advertisers on comedy stations, is not certain. Failure to obtain or retain rights to comedy content on acceptable terms, or at all, to successfully monetize and generate revenues from such content, or to effectively manage the numerous risks and challenges associated with such expansion could adversely affect our revenues and profitability. To the extent we choose, in the future, to offer additional types of content beyond music and comedy, such as news, talk and sports programming, we will be subject to many of these same risks.

Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

At January 31, 2011, we had federal net operating loss carryforwards of approximately $79.6 million and tax credit carryforwards of approximately $0.7 million. At January 31, 2011, we had state net operating loss carryforwards of approximately $75.6 million and tax credit carryforwards of approximately of $1.8 million. Under Section 382/383 of the Internal Revenue Code of 1986, as amended, or the Code, if a corporation undergoes an “ownership change,” the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes, such as research tax credits, to offset its post-change income may be limited. In general, an “ownership change” will occur if there is a cumulative change in our ownership by “5-percent shareholders” that exceeds 50 percentage points over a rolling three-year period. Similar rules may apply under state tax laws. As a result of prior equity issuances and other transactions in our stock, we have previously experienced “ownership changes” under section 382 of the Code and comparable state tax laws. We may also experience ownership changes in the future as a result of this issuance or future transactions in our stock. As a result, if we earn net taxable income, our ability to use our pre-change net operating loss carryforwards or other pre-change tax attributes to offset United States federal and state taxable income is subject to limitations.

If we cannot maintain our corporate culture as we grow, we could lose the innovation, teamwork and focus that contribute crucially to our business.

We believe that a critical component of our success is our corporate culture, which we believe fosters innovation, encourages teamwork, cultivates creativity and promotes focus on execution. We have invested substantial time, energy and resources in building a highly collaborative team that works together effectively in a non-hierarchical environment designed to promote openness, honesty, mutual respect and pursuit of common goals. As we develop the infrastructure of a public company and continue to grow, we may find it difficult to maintain these valuable aspects of our corporate culture. Any failure to preserve our culture could negatively impact our future success, including our ability to attract and retain employees, encourage innovation and teamwork and effectively focus on and pursue our corporate objectives.

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Federal, state and industry regulations as well as self-regulation related to privacy and data security concerns pose the threat of lawsuits and other liability, require us to expend significant resources, and may hinder our ability and our advertisers’ ability to deliver relevant advertising.

We collect and utilize demographic and other information, including personally identifiable information, from and about our listeners as they interact with our service. For example, to register for a Pandora account, our listeners must provide the following information: age, gender, zip code and e-mail address. Listeners must also provide their credit card or debit card numbers and other billing information in connection with additional service offerings. We also may collect information from our listeners when they enter information on their profile page, post comments on other listeners’ pages, use other community or social networking features that are part of our service, participate in polls or contests or sign up to receive e-mail newsletters. Further, we and third parties use tracking technologies, including “cookies” and related technologies, to help us manage and track our listeners’ interactions with our service and deliver relevant advertising.

Various federal and state laws and regulations govern the collection, use, retention, sharing and security of the data we receive from and about our listeners. Privacy groups and government bodies have increasingly scrutinized the ways in which companies link personal identities and data associated with particular users or devices with data collected through the internet, and we expect such scrutiny to continue to increase. Alleged violations of laws and regulations relating to privacy and data security, and any relevant claims, may expose us to potential liability and may require us to expend significant resources in responding to and defending such allegations and claims. For example, in late 2010 and early 2011, we were named as a defendant in several class action lawsuits alleging, among other things, violations of computer fraud, computer trespass and privacy laws. In addition, in early 2011, we were served with a subpoena to produce documents in connection with a federal grand jury, which we believe was convened to investigate the information sharing processes of certain popular applications that run on the Apple and Android mobile platforms. While we were informed that we are not a specific target of the investigation, and we believe that similar subpoenas were issued on an industry-wide basis to the publishers of numerous other smartphone applications, we will likely incur legal costs related to compliance with the subpoena, management’s attention could be diverted and there is no guarantee that we will avoid costly litigation. Claims or allegations that we have violated laws and regulations relating to privacy and data security have resulted and could in the future result in negative publicity and a loss of confidence in us by our listeners and our advertisers, and may subject us to fines by credit card companies and loss of our ability to accept credit and debit card payments.

Existing privacy-related laws and regulations are evolving and subject to potentially differing interpretations, and various federal and state legislative and regulatory bodies may expand current or enact new laws regarding privacy and data security-related matters. We may find it necessary or desirable to join self-regulatory bodies or other privacy-related organizations that require compliance with their rules pertaining to privacy and data security. We also may be bound by contractual obligations that limit our ability to collect, use, disclose, and leverage listener data and to derive economic value from it. New laws, amendments to or re-interpretations of existing laws, rules of self-regulatory bodies, industry standards and contractual obligations, as well as changes in our listeners’ expectations and demands regarding privacy and data security, may limit our ability to collect, use, and disclose, and to leverage and derive economic value from listener data. We may also be required to expend significant resources to adapt to these changes and to develop new ways to deliver relevant advertising or otherwise provide value to our advertisers. In particular, government regulators have proposed “do not track” mechanisms, and requirements that users affirmatively “opt-in” to certain types of data collection that, if enacted into law or adopted by self-regulatory bodies or as part of industry standards, could significantly hinder our ability to collect and use data relating to listeners. Restrictions on our ability to collect, access and harness listener data, or to use or disclose listener data or any profiles that we develop using such data, would in turn limit our ability to stream personalized music content to our listeners and offer targeted advertising opportunities to our advertising customers, each of which are critical to the success of our business.

We have incurred, and will continue to incur, expenses to comply with privacy and security standards and protocols imposed by law, regulation, self-regulatory bodies, industry standards and contractual obligations.

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Increased regulation of data utilization and distribution practices, including self-regulation and industry standards, could increase our cost of operation, limit our ability to grow our operations or otherwise adversely affect our business.

If our security systems are breached, we may face civil liability and public perception of our security measures could be diminished, either of which would negatively affect our ability to attract listeners and advertisers.

Techniques used to gain unauthorized access are constantly evolving, and we may be unable to anticipate or prevent unauthorized access to data pertaining to our listeners, including credit card and debit card information and other personally identifiable information. If an actual or perceived breach of security occurs of our systems or a vendor’s systems, we may face civil liability and public perception of our security measures could be diminished, either of which would negatively affect our ability to attract listeners, which in turn would harm our efforts to attract and retain advertisers. We also would be required to expend significant resources to mitigate the breach of security and to address related matters.

We cannot control the actions of third parties who may have access to the listener data we collect. The integration of the Pandora service with applications provided by third parties represents a significant growth opportunity for us, but we may not be able to control such third parties’ use of listeners’ data, ensure their compliance with the terms of our privacy policies, or prevent unauthorized access to, or use or disclosure of, listener information, any of which could hinder or prevent our efforts with respect to growth opportunity.

Any failure, or perceived failure, by us to maintain the security of data relating to our listeners and employees, to comply with our posted privacy policy, laws and regulations, rules of self-regulatory organizations, industry standards, and contractual provisions to which we may be bound, could result in the loss of confidence in us, or result in actions against us by governmental entities or others, all of which could result in litigation and financial losses, and could potentially cause us to lose listeners, advertisers, revenue, and employees.

We are subject to a number of risks related to credit card and debit card payments we accept.

We accept payments exclusively through credit and debit card transactions. For credit and debit card payments, we pay interchange and other fees, which may increase over time. An increase in those fees would require us to either increase the prices we charge for our products, which could cause us to lose subscribers and subscription revenue, or suffer an increase in our operating expenses, either of which could harm our operating results.

If we or any of our processing vendors have problems with our billing software, or the billing software malfunctions, it could have an adverse effect on our subscriber satisfaction and could cause one or more of the major credit card companies to disallow our continued use of their payment products. In addition, if our billing software fails to work properly and, as a result, we do not automatically charge our subscribers’ credit cards on a timely basis or at all, we could lose subscription revenue, which would harm our operating results.

We are also subject to payment card association operating rules, certification requirements and rules governing electronic funds transfers, which could change or be reinterpreted to make it more difficult for us to comply. Currently, we are assessing whether we are fully compliant with the Payment Card Industry, or PCI, Data Security Standard, or PCI DSS, a security standard with which companies that collect, store, or transmit certain data regarding credit and debit cards, credit and debit card holders, and credit and debit card transactions are required to comply. Our failure to comply fully with PCI DSS may violate payment card association operating rules, federal and state laws and regulations, and the terms of our contracts with payment processors and merchant banks. Such failure to comply fully also may subject us to fines, penalties, damages, and civil liability, and may result in the loss of our ability to accept credit and debit card payments. Further, there is no guarantee that, even if PCI DSS compliance is achieved, we will maintain PCI DSS compliance or that such

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compliance will prevent illegal or improper use of our payment systems or the theft, loss, or misuse of data pertaining to credit and debit cards, credit and debit card holders and credit and debit card transactions.

If we fail to adequately control fraudulent credit card transactions, we may face civil liability, diminished public perception of our security measures and significantly higher credit card-related costs, each of which could adversely affect our business, financial condition and results of operations.

If we are unable to maintain our chargeback rate or refund rates at acceptable levels, credit card and debit card companies may increase our transaction fees or terminate their relationships with us. Any increases in our credit card and debit card fees could adversely affect our results of operations, particularly if we elect not to raise our rates for our service to offset the increase. The termination of our ability to process payments on any major credit or debit card would significantly impair our ability to operate our business.

If we fail to detect click fraud or other invalid clicks on ads, we could lose the confidence of our advertisers, which would cause our business to suffer.

Our business relies on delivering positive results to our advertising customers. We are exposed to the risk of fraudulent and other invalid clicks or conversions that advertisers may perceive as undesirable. A major source of invalid clicks could result from click fraud where a listener intentionally clicks on ads for reasons other than to access the underlying content of the ads. If fraudulent or other malicious activity is perpetrated by others and we are unable to detect and prevent it, or if we choose to manage traffic quality in a way that advertisers find unsatisfactory, the affected advertisers may experience or perceive a reduced return on their investment in our advertising products, which could lead to dissatisfaction with our advertising programs, refusals to pay, refund demands or withdrawal of future business. This could damage our brand and lead to a loss of advertisers and revenue.

Our success depends on our listeners’ continued high-speed access to the internet and wireless devices and the continued reliability of the related infrastructure.

Because our service is designed primarily to work over the internet, our revenue growth depends on our listeners’ low cost, high-speed access to the internet, as well as the continued maintenance and development of the internet infrastructure, including the wireless internet infrastructure. The future delivery of our service will depend on third-party internet service providers and wireless telecommunication companies expanding high-speed internet access and wireless networks, maintaining reliable networks with the necessary speed, data capacity and security, and developing complementary products and services for providing reliable and timely wired and wireless internet access and services. The success of our business depends directly on the continued accessibility, maintenance and improvement of the internet and, in particular, access to the internet through wireless infrastructure, to permit high-quality streaming of content and provide a convenient and reliable platform for customer interaction. All of these factors are outside of our control.

To the extent that the internet and the wireless internet infrastructure continue to experience an increasing number of listeners, frequency of use and expanding bandwidth requirements, the internet and wireless networks may become congested and unable to support the demands placed on them, and their performance and reliability may decline. In addition, the wireless communications companies that provide our listeners with access to the internet through wireless networks may raise their rates or impose data usage limits, which could cause our listeners to decrease their usage of our service or our listenership to decline. Any future internet or wireless network outages, interruptions, bandwidth constraints, rate increases or data usage limits could adversely affect our ability to provide service to our listeners and advertising customers.

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Some of our services and technologies may use “open source” software, which may restrict how we use or distribute our service or require that we release the source code of certain services subject to those licenses.

Some of our services and technologies may incorporate software licensed under so-called “open source” licenses, including, but not limited to, the GNU General Public License and the GNU Lesser General Public License. Such open source licenses typically require that source code subject to the license be made available to the public and that any modifications or derivative works to open source software continue to be licensed under open source licenses. Few courts have interpreted open source licenses, and the manner in which these licenses may be interpreted and enforced is therefore subject to some uncertainty. We rely on multiple software programmers to design our proprietary technologies, and we do not exercise complete control over the development efforts of our programmers and we cannot be certain that our programmers have not incorporated open source software into our proprietary products and technologies or that they will not do so in the future. In the event that portions of our proprietary technology are determined to be subject to an open source license, we could be required to publicly release the affected portions of our source code, re-engineer all or a portion of our technologies, or otherwise be limited in the licensing of our technologies, each of which could reduce or eliminate the value of our services and technologies and materially and adversely affect our ability to sustain and grow our business.

Government regulation of the internet is evolving, and unfavorable developments could have an adverse affect on our operating results.

We are subject to general business regulations and laws, as well as regulations and laws specific to the internet. Such laws and regulations cover taxation, user privacy, data collection and protection, copyrights, electronic contracts, sales procedures, automatic subscription renewals, credit card processing procedures, consumer protections, broadband internet access and content restrictions. We cannot guarantee that we have been or will be fully compliant in every jurisdiction, as it is not entirely clear how existing laws and regulations governing issues such as privacy, taxation and consumer protection apply to the internet. Moreover, as internet commerce continues to evolve, increasing regulation by federal, state and foreign agencies becomes more likely. The adoption of any laws or regulations that adversely affect the popularity or growth in use of the internet, including laws limiting internet neutrality, could decrease listener demand for our service offerings and increase our cost of doing business. Future regulations, or changes in laws and regulations or their existing interpretations or applications, could also hinder our operational flexibility, raise compliance costs and result in additional historical or future liabilities for us, resulting in adverse impacts on our business and our operating results.

We could be adversely affected by regulatory restrictions on the use of mobile and other electronic devices in motor vehicles, and legal claims are possible from use of such devices while driving.

Regulatory and consumer agencies have increasingly focused on distraction to drivers that may be associated with use of mobile and other devices in motor vehicles. In 2010, the U.S. Department of Transportation identified driver distraction as a top priority, and we anticipate new regulatory activity in this area. Regulatory restrictions on how drivers and passengers in automobiles may engage with devices on which our service is broadcast could inhibit our ability to increase listener hours and generate ad revenue, which would harm our operating results. In addition, concerns over driver distraction due to use of mobile and other electronic devices to access our service in motor vehicles could result in litigation and negative publicity.

We rely on third parties to provide software and related services necessary for the operation of our business.

We incorporate and include third-party software into and with our applications and service offerings and expect to continue to do so. The operation of our applications and service offerings could be impaired if errors occur in the third-party software that we use. It may be more difficult for us to correct any defects in third-party software because the development and maintenance of the software is not within our control. Accordingly, our business could be adversely affected in the event of any errors in this software. There can be no assurance that

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any third-party licensors will continue to make their software available to us on acceptable terms, to invest the appropriate levels of resources in their software to maintain and enhance its capabilities, or to remain in business. Any impairment in our relationship with these third-party licensors could harm our ability to maintain and expand the reach of our service, increase listener hours and sell advertising each of which could harm our operating results, cash flow and financial condition.

The impact of worldwide economic conditions, including the effect on advertising budgets and discretionary entertainment spending behavior, may adversely affect our business and operating results.

Our financial condition is affected by worldwide economic conditions and their impact on advertising spending. Expenditures by advertisers generally tend to reflect overall economic conditions, and to the extent that the economy continues to stagnate, reductions in spending by advertisers could have a serious adverse impact on our business. In addition, we provide an entertainment service, and payment for our Pandora One subscription service or payment of fees to receive our service once a listener reaches 40 hours use per month on a traditional computer may be considered discretionary on the part of some of our current and prospective subscribers or listeners, who may choose to use a competing free service. To the extent that overall economic conditions reduce spending on discretionary activities, our ability to retain current and obtain new subscribers could be hindered, which could reduce our subscription revenue and negatively impact our business.

Our business is subject to the risks of earthquakes, fires, floods and other natural catastrophic events and to interruption by man-made problems such as computer viruses or terrorism.

Our systems and operations are vulnerable to damage or interruption from earthquakes, fires, floods, power losses, telecommunications failures, terrorist attacks, acts of war, human errors, break-ins or similar events. For example, a significant natural disaster, such as an earthquake, fire or flood, could have a material adverse impact on our business, operating results and financial condition, and our insurance coverage may be insufficient to compensate us for losses that may occur. Our principal executive offices are located in the San Francisco Bay Area, a region known for seismic activity. In addition, acts of terrorism could cause disruptions in our business or the economy as a whole. Our servers may also be vulnerable to computer viruses, break-ins and similar disruptions from unauthorized tampering with our computer systems, which could lead to interruptions, delays, loss of critical data or the unauthorized disclosure of confidential customer data. We currently have very limited disaster recovery capability, and our business interruption insurance may be insufficient to compensate us for losses that may occur. As we rely heavily on our servers, computer and communications systems and the internet to conduct our business and provide high quality service to our listeners, such disruptions could negatively impact our ability to run our business, result in loss of existing or potential listeners and advertisers and increased maintenance costs, which would adversely affect our operating results and financial condition.

Risks Related to this Offering and Owning Our Common Stock

An active, liquid and orderly market for our common stock may not develop or be sustained, the trading prices of our common stock may be volatile and you may be unable to sell your shares at or above the offering price.

Prior to this offering, there has been no public market for shares of our common stock. An active trading market for our common stock may not develop or be sustained, which could depress the market price of our common stock and could affect your ability to sell your shares. The initial public offering price will be determined through negotiations between us and the representatives of the underwriters and may bear no relationship to the price at which our common stock will trade following the completion of this offering. The trading price of our common stock following this offering could be subject to wide fluctuations in response to the risk factors described in this prospectus and others beyond our control including:

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In addition, the stock market has experienced extreme price and volume fluctuations that often have been unrelated or disproportionate to the operating performance of those companies. These fluctuations may be even more pronounced in the trading market for our stock shortly following this offering. Securities class action litigation has often been instituted against companies following periods of volatility in the overall market and in the market price of a company’s securities. Such litigation, if instituted against us, could result in very substantial costs, divert our management’s attention and resources and harm our business, operating results and financial condition.

Sales of substantial amounts of our common stock in the public markets, or the perception that they might occur, could reduce the price that our common stock might otherwise attain and may dilute your voting power and your ownership interest in us.

Sales of substantial amounts of our common stock in the public market following our initial public offering, or the perception that such sales could occur, could adversely affect the market price of our common stock and may make it more difficult for you to sell your common stock at a time and price that you deem appropriate. Based on the number of shares outstanding as of April 30, 2011, upon the closing of this offering, we will have outstanding              shares of common stock (or              shares of common stock if the underwriters exercise in full their over-allotment option). The shares of our common stock that we are selling in this offering may be resold immediately in the public market unless they are held by “affiliates,” as that term is defined in Rule 144 of the Securities Act.

Subject to certain exceptions described under the caption “Underwriters,” we and all of our directors and officers and substantially all of our equityholders have agreed not to offer, sell or agree to sell, directly or indirectly, any shares of common stock without the permission of the representatives of the underwriters for a period of 180 days from the date of this prospectus. When the lock-up period expires, we and our locked-up security holders will be able to sell our shares in the public market. In addition, the underwriters may, in their sole discretion, release all or some portion of the shares subject to lock-up agreements prior to expiration of the lock-up period. See the section of this prospectus captioned “Shares Eligible for Future Sale” for more information. Sales of a substantial number of such shares upon expiration, or the perception that such sales may occur, or early release, of the lock-up could cause our share price to fall or make it more difficult for you to sell your common stock at a time and price that you deem appropriate.

Holders of approximately              shares, or         %, of our common stock will have rights, subject to some conditions, to require us to file registration statements covering the sale of their shares or to include their shares in registration statements that we may file for ourselves or other stockholders. We also intend to register the offer and sale of all shares of common stock that we may issue under our equity compensation plans. Once we register the offer and sale of shares for the holders of registration rights and option holders, they can be freely sold in the public market upon issuance, subject to the lock-up agreements described in the section of this prospectus captioned “Underwriters” or unless they are held by “affiliates,” as that term is defined in Rule 144 of the Securities Act.

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We also may issue our shares of common stock or securities convertible into our common stock from time to time in connection with a financing, acquisition, investments or otherwise. Any such issuance could result in substantial dilution to our existing stockholders and cause the trading price of our common stock to decline.

If securities or industry analysts do not publish research or publish inaccurate or unfavorable research about our business, our stock price and trading volume could decline.

The trading market for our common stock will be influenced by the research and reports that securities or industry analysts publish about us or our business. Securities and industry analysts do not currently, and may never, publish research focused on our company. If no securities or industry analysts commence coverage of our company, the price and trading volume of our stock likely would be negatively impacted. If securities or industry analysts initiate coverage, and one or more of the analysts who cover us downgrade our stock or publish inaccurate or unfavorable research about our business, our stock price would likely decline. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, demand for our stock could decrease, which might cause our stock price and trading volume to decline.

Our management will have broad discretion over the use of the proceeds we receive in this offering and may not apply the proceeds in ways that increase the value of your investment.

Our management generally will have broad discretion to use the net proceeds to us from this offering, and you will be relying on the judgment of our management regarding the application of these proceeds. Our management might not apply the net proceeds from this offering in ways that increase the value of your investment. Except as described in the section of this prospectus captioned “Use of Proceeds,” we have not allocated the net proceeds from this offering for any specific purposes. Until we use the net proceeds to us from this offering, we plan to invest them, and these investments may not yield a favorable rate of return. If we do not invest or apply the net proceeds from this offering in ways that enhance stockholder value, we may fail to achieve expected financial results, which could cause our stock price to decline.

Because some existing stockholders will together beneficially own approximately         % of our outstanding stock after this offering, the voting power of other stockholders, including purchasers in this offering, will be effectively limited.

After this offering, it is anticipated that our officers, directors, greater than 5% stockholders and their affiliates will beneficially own or control, directly or indirectly,              shares of common stock, which in the aggregate will represent approximately         % of the outstanding shares of common stock, assuming no exercise of the underwriters’ over-allotment option. As a result, if some of these persons or entities act together, they will have significant influence over the outcome of matters submitted to our stockholders for approval, including the election of directors. This may delay or prevent an acquisition or cause the market price of our stock to decline. Some of these persons or entities may have interests different form yours. For example, because many of these stockholders purchased their shares at prices substantially below the price at which shares are being sold in this offering and have held their shares for a relatively longer period, they may be more interested in selling the company to an acquiror than other investors or may want us to pursue strategies that are different from the wishes of other investors.

Our charter documents, Delaware law and certain terms of our music licensing arrangements could discourage takeover attempts and lead to management entrenchment.

Our certificate of incorporation and bylaws that will be in effect upon the closing of this offering contain provisions that could delay or prevent a change in control of our company. These provisions could also make it difficult for stockholders to elect directors that are not nominated by the current members of our board of directors or take other corporate actions, including effecting changes in our management. These provisions include:

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Section 203 of the Delaware General Corporation Law governs us. These provisions may prohibit large stockholders, in particular those owning 15% or more of our outstanding voting stock, from merging or combining with us for a certain period of time. In addition, if we are acquired, certain terms of our music licensing arrangements, including favorable royalty rates, that currently apply to us may not be available to an acquiror. These terms may discourage a potential acquiror from making an offer to buy us or may reduce the price such a party may be willing to offer.

Investors purchasing common stock in this offering will experience immediate and substantial dilution.

Purchasers of our common stock in this offering will incur immediate and substantial dilution of $         per share in the net tangible book value of our common stock from the assumed initial public offering price of $         per share, which is the midpoint of the estimated range set forth on the cover of this prospectus. This dilution is due in large part to earlier investors having paid substantially less than the initial public offering price when they purchased their shares. Investors purchasing shares of common stock in this offering will contribute approximately         % of the total amount we have raised since our inception, but will own only approximately         % of our total common stock immediately following the completion of this offering. As a result, investors who will control a majority of our outstanding stock will have substantially lower cost basis in their stock than investors in this offering, and as such may have interests that differ from investors in this offering. To the extent outstanding stock options and warrants are ultimately exercised, there will be further dilution to investors in this offering. In addition, if the underwriters exercise their over-allotment option to purchase additional shares from us, investors in this offering will experience additional dilution. See the section captioned “Dilution” for additional information.

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