Throbbing back to life after several years off, the YYY's pack "Sacrilege" with a mess of classic moves: While guitar buzz and synth beeps make out in the corner, the rock/dance baby rides an almost-disco groove, and Karen O alternates between yelling (through the phone, it seems) and a full-on seduction-mumble. The new trick is the outta-nowhere gospel-style choir at the end, tearing the proverbial roof off. As Homer Simpson might say: "Sacrilicious!"

“The A Team”

This debut track from the then-20-year-old British singer-songwriter has a dark story behind it. Sheeran says he culls songwriting inspiration from "viewing other people's situations," which, for the heroine in "The A Team," involves drug addiction and prostitution that began as a teen. Sheeran paints the woman's trials with haunting imagery such as "But lately her face seems/Slowly sinking, wasting/Crumbling like pastries." "I did a gig at a homeless shelter, [and the song] is about one of the women there. It's her story," he said.