The persistent current popularity of blood-sucking bucks (and the chicks who love them) heads to the 'hood. Bypassing Team Edward and Team Jacob completely, teeth-barred Trina is "not remorsey" as she hops on Team Gucci: "Throw me in a movie/when you see me you salute true blood/ ooh-wee!" In turn, Gucci raps over tolling bells and casket-rattling bass in an appropriately undead rasp: "I believe in vampires/ lil' shorty stay up all night/ trying to build an empire." On that note, expect a sequel shortly, shorty.

“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."