Amazon MP3 is an online music store owned and operated by Amazon.com. Launched in public beta on September 25, 2007, in January 2008 it became the first music store to sell music without digital rights management (DRM) from the four major music labels (EMI, Universal, Warner Music, and Sony BMG), as well as many independents. All tracks were originally sold in 256 kilobits-per-second variable bitrate MP3 format without per-customer watermarking or DRM; however some tracks are now watermarked. Licensing agreements with recording companies restrict the countries in which music can be sold: Amazon.com only sells music to US customers while Amazon.co.uk only sells music to UK customers.

After the United States, Amazon MP3 was launched in the United Kingdom on December 3, 2008, in Germany on April 1, 2009, and in France on June 10, 2009. The German edition has been available in Austria and Switzerland since December 3, 2009.

Amazon launched Amazon Cloud Player as an extension to Amazon MP3 store in the United States on March 29, 2011.

Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and actress. Perry grew up with gospel music, and during her first year of high school she pursued a music career as Katy Hudson, releasing her first studio album called Katy Hudson which failed to chart. She recorded a solo album later, which was never released. After signing with Capitol Music Group in 2007, her fourth record label in seven years, she adopted the stage name Katy Perry.

She first gained recognition with the release of her first mainstream album, One of the Boys in 2008, which spawned three Billboard Hot 100 top-ten songs—"I Kissed A Girl", "Hot n Cold" and "Waking Up In Vegas". Perry supported the album with her Hello Katy Tour. In 2010, her third studio album, Teenage Dream (2010), which topped the Billboard 200 chart, and spawned five number one singles—"California Gurls", "Teenage Dream", "Firework", "E.T." and "Last Friday Night (T.G.I.F.)"—Teenage Dream was the only album (after Michael Jackson's Bad)—to do so, and the first female in history to achieve this milestone. She embarked on the California Dreams Tour, which grossed nearly $60 million worldwide. Perry re-released the album under the name of Teenage Dream: The Complete Confection on March 26, 2012, and the re-release has already spawned the number-one single "Part of Me".

Jed Tucker Whedon (born July 18, 1974) is a screenwriter and musician. Jed is from a family of writers: he is the son of screenwriter Tom Whedon, grandson of screenwriter John Whedon, and the brother of screenwriter Zack Whedon and producer/director/writer Joss Whedon. On April 19, 2009, he married fellow screenwriter Maurissa Tancharoen.

Alongside his brothers Joss and Zack and his then fiancée Maurissa Tancharoen, he co-created and co-wrote the parody musical Dr. Horrible's Sing-Along Blog. It was the subject of a salute by The Paley Center for Media and won an Emmy Award for Outstanding Special Class - Short-format Live-Action Entertainment Programs.

Prior to Dr. Horrible, Jed composed scores for video games, and was a member of the now defunct Los Angeles-based band The Southland. In 2010, he released an album entitled History of Forgotten Things under the band name "Jed Whedon and the Willing". Assisting him on the album were his wife, Maurissa Tancharoen and their mutual friend Felicia Day.

Kathryn Felicia Day (born on June 28, 1979) is an American actress and singer, known for her work as "Vi" on the TV series Buffy the Vampire Slayer and for parts in movies such as Bring It On Again and June, as well as the Internet musical, Dr. Horrible's Sing-Along Blog. Day is also the star, script writer and producer of the original web series The Guild, a show loosely based on her life as a gamer. She also starred in the Dragon Age web series Dragon Age: Redemption, which she wrote. She is a member of the Board of Directors of the International Academy of Web Television.

Day began her acting career at the age of 7 when she starred as Scout in a local production of To Kill a Mockingbird. She studied operatic singing and ballet professionally, performing at concerts and competitions nationwide. Home-schooled throughout much of her childhood, she began college at the age of 16.

She was a National Merit Scholar (1995) and graduated as valedictorian of her class. An accomplished violinist, Day was accepted to the Juilliard School of Music but chose to attend the University of Texas at Austin on a full scholarship in violin performance. She double majored in mathematics and music performance.

Glenn Edward Lee Beck (born February 10, 1964) is an American conservative radio host, vlogger, author, entrepreneur, political commentator and former television host. He hosts the Glenn Beck Program, a nationally syndicated talk-radio show that airs throughout the United States on Premiere Radio Networks. He formerly hosted the Glenn Beck television program, which ran from January 2006 to October 2008 on HLN and from January 2009 to June 2011 on the Fox News Channel. Beck has authored six New York Times–bestselling books. Beck is the founder and CEO of Mercury Radio Arts, a multimedia production company through which he produces content for radio, television, publishing, the stage, and the Internet. It was announced on April 6, 2011, that Beck would "transition off of his daily program" on Fox News later in the year but would team with Fox to "produce a slate of projects for FOX News Channel and FOX News' digital properties". Beck's last daily show on the network was June 30, 2011. In 2012, The Hollywood Reporter named Beck on its Digital Power Fifty list.