Week after week, 13-year-old Carly Rose Sonenclar delivered powerhouse vocals and mopped the floor with the competition, so it's hard to pick her "best." But "Over the Rainbow" may very well be it, considering it helped her leap-frog over good ol' boy Tate Stevens to claim the Number One spot on the leaderboard for the first time. It garnered a standing O from the judges and left Simon Cowell and Demi Lovato debating whether she was an "alien." Having cut her teeth on Broadway, it's no surprise she's a frontrunner this season. But she wound up having to settle for second place. Still, alien, robot or just a classic overachiever, you can't deny the girl's got talent.