15. NELLY & TIM MCGRAW''Over and Over'' (2004) Hip-hop's good-times guy and country music's family man wallowed in romantic regret on this spare, plaintive lonesome-hearts ballad.
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Taylor Swift and T-Pain?! Eminem and Elton?! William Shatner and...anyone?! See our roster of perfectly odd musical combos, and hear how they sound together
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