Mike Posner

Making two of the year's most talked-about, genre-defying mix tapes is never easy -- especially not if you're doing it in your dorm room in the middle of the night, with homework piling up, friends banging on your door and the campus police barging in to shut down the noise you're making.

"I sacrificed my social life last semester," shrugs Mike Posner, the producer/singer wunderkind who just finished his last class at Duke University, with a major in business and sociology, a semester early and with a GPA of 3.5. Posner will walk with the rest of his class for graduation in May 2010. But then the 22-year-old -- who first emerged on his dorm-born mixtape "A Matter of Time," released ...

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