Guitar Heaven reprises the cameo-heavy formula Carlos Santana has used since 1999's Supernatural, only this time the celeb vocalists lay into an assortment of classic-rock covers. The performances are mostly faithful to the originals, and Chris Daughtry gives Def Leppard's "Photograph" a credible kick. But only about half the songs get any traction — "Back in Black," where Nas rhymes beside anonymous rock-chick vocals, sounds like a Super Bowl halftime show. The best turn is from a smaller name: India.Arie, who finds the soul in "While My Guitar Gently Weeps." As for Santana? Smooth, as usual.

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“Time to Pretend”

Listening to MGMT’s breakthrough song, one might interpret it as being about the excesses of rock stardom, but it’s actually about the duo’s pet praying mantis. Ben Goldwasser and Andrew VanWyngarden told Rolling Stone they got the idea from the insect's jerky movements. The mantis died, but the two bandmates kept the egg sack and allowed the hundreds of eggs to hatch. “We tried to name them all, but they died after a day,” said Goldwasser, with VanWyngarden chiming in, “But the praying mantis dance inspired us.”