Singer Jill Scott and musician/DJ Moby during rehearsals with Blue Man Group

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Elton John and Eminem

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Paul McCartney, Jay-Z (L) and Linkin Park

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Singer Tina Turner and Beyonce

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The Jonas Brothers with Stevie Wonder

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Kanye West, T.I., M.I.A., Jay-Z, Linkin Park

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Beyonce and Prince

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Gwyneth Paltrow and Cee-Lo

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Taylor Swift and Stevie Nicks.

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