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Nile Rodgers (left) and Pharrell Williams (right) on stage with Stevie Wonder during a performance of Daft Punk's "Get Lucky" during the 2014 Grammy Awards. Kevork Djansezian/Getty Images hide caption

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Frank Black (right) and Joey Santiago of the Pixies perform at the Coachella Valley Music and Arts Festival in 2004, the year the band reunited after more than a decade apart. Tim Mosenfelder/Getty Images hide caption

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Bruno Mars (left) and Mark Ronson, whose song, "Uptown Funk!," has been the No. 1 song in the country for four weeks in a row. Vevo/Courtesy of the artist hide caption

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Some of A$AP Mob at BET's 106 & Park Studios in July 2013. Standing, from left to right, ASAP Bari, ASAP Yams and ASAP Illz. In front, from left to right, ASAP Ferg, ASAP Twelvyy and ASAP Rocky. John Ricard/Getty Images hide caption

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International pop star Demis Roussos hams it up for the camera at the Cannes Film Festival in May 1975. Roussos died in Athens Sunday at age 68. Ralph Gatti/AFP/Getty Images hide caption

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David Oyelowo (left) as Dr. Martin Luther King, Jr. and Carmen Ejogo as Coretta Scott King in Selma. Atsushi Nishijima/Paramount Pictures hide caption

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