All hail Fergie, the duchess of vaginal metaphors! Last year, in the Black Eyed Peas' "My Humps," Fergie was a camel stomping her lady lumps across the desert; in her solo smash "London Bridge," she's the mighty bridge across the River Thames, paving the way for future sequels like "Panama Canal" or "Sacred Ruins of Machu Picchu." The Dutchess is a shameless solo debut full of Eighties-style electro bangers, mostly produced by the Peas' Will.i.am, though Atlanta mogul Polow Da Don steals the show on "London Bridge" and "Glamorous." "London Bridge" is a total rip of "Hollaback Girl," but adding an actual song to "Hollaback Girl" is a brilliant idea. Fergie samples Afro Rican in "Fergielicious" and Little Richard in "Clumsy." You might get tired of hearing her come after a while — but then it's time for "Mary Jane Shoes," a strangely uplifting reggae ode to Fergie's favorite footwear.

“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."