Quiet storm gets a freaky sci-fi makeover on the Diplo-produced "Climax," which sets Usher’s plaintively pleading falsetto atop a shape-shifting landscape of clicks, hisses, whooshes and bass-y synth gurgles. The title suggests a booty-call anthem, and while the lush sound might have its uses in the boudoir, this is really a breakup lament. "Where are you now, when I need you around?/I'm on my knees, but it seems we’re going nowhere fast/We've reached the climax," Usher concedes, grieving for a relationship that's passed the point of no return. 

Listen To Usher's "Climax":•

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• Photos: Random Notes

“I'm Yours”

Jason Mraz re-emerged after his disappointing second album with this lead single, a Jack Johnson-esque ditty about giving yourself fully to someone else. The success of the reggae-tinged song (it earned two Grammy nods and a spot on the Billboard singles chart for well over a year) was something the folk-pop singer never predicted when he wrote it in 15 minutes at home. "I played a happy-hippie chord progression that would probably work without 50 different Bob Marley songs," he told Rolling Stone. "I thought, 'It's too novelty. This is a nursery rhyme,'" concluding that "you can never guess what's gonna be a hit."