Whitney Houston performs in 1988. David Corio/Getty Images hide caption

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The London headquarters of EMI, whose sale this year brought the number of major labels from four to three. Simon Dawson/Bloomberg via Getty Images hide caption

itoggle caption Simon Dawson/Bloomberg via Getty Images

The real Joyce Hatto, pre-scandal, with condutor Martin Fogel and composer Walter Gaze Cooper at the piano in 1954. Fred Ramage/Getty Images hide caption

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An image provided by Spotify shows music artwork displayed on its mobile app. Spotify began offering a free radio service for mobile devices in the U.S. in June. Before that, customers had to pay $10 per month to use its mobile app. Spotify Radio/AP hide caption

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The Killers perform on the season finale of NBC's The Voice last week. NBCU Photo Bank via Getty Images hide caption

itoggle caption NBCU Photo Bank via Getty Images

The stars of 2012, online and on air (from left): Nate Ruess of fun., Gotye, Carly Rae Jepsen and Psy. Matt Roberts/Getty Images, Tony Nelson/Corbis Images, Kevin Winter/Getty Images, Kevin Winter/Getty Images hide caption

itoggle caption Matt Roberts/Getty Images, Tony Nelson/Corbis Images, Kevin Winter/Getty Images, Kevin Winter/Getty Images

Choir! Choir! Choir! performs at the Toronto venue Lee's Palace, led by Daveed Goldman (left, with guitar) and Nobu Adilman. Joseph Fuda hide caption

itoggle caption Joseph Fuda

Ernie K-Doe and his fans at the Warehouse in New Orleans in 1974. Michael P. Smith/The Historic New Orleans Collection hide caption

itoggle caption Michael P. Smith/The Historic New Orleans Collection

Dancer Fogo de Deus, who is part of the Os Kuduristas project of traveling kuduro artists. courtesy of Os Kuduristas hide caption

itoggle caption courtesy of Os Kuduristas

Tenor Rolando Villazon: "I don't think you learn anything from blogs and reviews." Philippe Merle/AFP/Getty Images hide caption

itoggle caption Philippe Merle/AFP/Getty Images