The music moguls kick off an N.Y.C. event with a show of solidarity. Plus: Brad & Angelina, Mary-Kate Olsen and more

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SIGN OF THE TIMES

Def Jam label mates Jay-Z and Kanye West throw up the Roc-A-Fella sign at GQ's 50th anniversary celebration at Cedar Lake in New York on Tuesday. "Kanye cares more about music than any person making music right now," Jay-Z told PEOPLE at the event.