"I'll stay with you/Till hell freezes over," Bernard Sumner intones on the ninth New Order album. Chances are he's not referring to his bandmates: Allegedly the final release from the massively influential dance-rock group's original lineup (bassist Peter Hook departed in 2007), Lost was cobbled of outtakes from its previous album, 2005's lackluster Waiting for the Siren's Call. Surprisingly, it's a much better record. The mesmeric dance-floor electronics on tracks such as "Shake It Up" recall Eighties classics like "Blue Monday," while Sumner's six-string chime and plangently defiant vocals make this accidental swan song feel industrial-grade wistful.

“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."