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Paul McCartney, Rihanna and Kanye West share the stage at the 57th Annual Grammy Awards in Los Angeles February 8, 2015. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Paul McCartney, Rihanna and Kanye West share the stage at the 57th Annual Grammy Awards in Los Angeles February 8, 2015. AFP PHOTO / ROBYN BECK        (Photo credit should read ROBYN BECK/AFP/Getty Images)