Neil Young hasn't dipped much into the old-time kiddie songs from this year's Americana in his latest Crazy Horse shows. Instead, he's using this tour to blow minds with intense new tunes that come on like pieces of an in-progress autobiographical song cycle. "Twisted Road" is an acoustic beauty; Young reminisces about hearing Dylan and the Dead on the radio. But "Walk Like a Giant" (also presumably from Young's next album, due this fall) is the mind-blower: an epic feedback monster, stretching to the 20-minute mark. It tackles familiar Young themes – the passing of time, the death of the hippie dream – with furious guitar noise and a whistle-along chorus. "Walk Like a Giant" is a fearsome sound: The old man takes a look at his life, and gets righteously pissed off at what he sees.

“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."