The Black Keys re-teamed with Danger Mouse to cut the first single off their new record — and they've never sounded tighter or funkier. Drummer Patrick Carney pounds the skins like a drugged-up Keith Moon, and Dan Auerbach cranks out a spiky riff that's laced with Hendrix-style guitar effects. 'Tighten Up' is definitely psychedelic, but these guys still have a thing for the blues: Auerbach yelps, 'Sick for days . . . I'm aching now,' with the raw intensity of Robert Johnson at the crossroads.

“Help Me”

Joni Mitchell wrote and recorded this song for her album Court and Spark, but she had to switch from her regular band to make the song sound exactly the way she wanted. "I had attempted to play my music with rock & roll players," she told Rolling Stone. "They’d laugh, 'Awww, isn't that cute? She's trying to teach us how to play.'" Mitchell switched to a jazz band, Tom Scott’s L.A. Express, and scored the biggest hit of her career in the process.