Adam Levine can sing, but can he act? The Maroon 5 frontman is making the leap from the stage to the big screen in Begin Again alongside Keira Knightley. We can't wait to see one of our favorite Voice judges work his acting chops, which reminds of us of some other musicians who've followed the same path. From Lenny Kravitz to Courtney Love, who do you think made the best transition?
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