Miley Cyrus: America's teen sweetheart, or God's gift to vice-squad sting operations? The Hannah Montana gal goes for a grown-up club sound, with Rihanna-style robot-disco thump and boy-crazy AutoTune vocals about how hot she is. She boasts, "I always get a 10, 'cause I'm built like that." If she gets a 10, what does he get — 15 to 20? It's no "Party in the USA" or "See You Again," but the chorus packs plenty of electro-fizz pizzazz.

“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.