KID CUDI
Where you've heard him: After setting the blogosphere abuzz with his hypnotic summer single ''Day 'n' Nite,'' the Cleveland-born rapper co-wrote four tracks for Kanye West's 808s & Heartbreak.
Big in '09 because: Having a recommendation from Kanye on his résumé should come in handy when he tries to win a wider audience with his debut album, Man on the Moon: The Guardians. — Simon Vozick-Levinson
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