"All year long, we wait for sun," sings Best Coast's Bethany Cosentino in this Converse-sponsored collaboration with rapper Kid Cudi and Vampire Weekend's Rostam Batmanglij. Well, here's some: A speedy blast of harmony-drenched guitar pop, "All Summer" exudes an undeniable beach-party vibe. Like a chocolate-dipped cone from Mister Softee, the tune's three-note hook isn't exactly built to last. (And Cudi's Chuck Taylor shout-out will make you cringe.) But for a de facto corporate jingle, "All Summer" couldn't be much brighter.

“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."