Did you watch "The Sing Off"?! It was an *awesome* show! It was a bunch of a capella groups competing against each other, and the judges were Ben Folds, Sara Bareilles, and Shawn Stockman (of Boyz II Men fame). Oh, and it was hosted by Nick Lachey. Need I say more?!?! I really, really hope it returns for another season, 'cause it was the bomb.com.
ANYway, the group rockin' Carol of the Bells below is Pentatonix, who won last season. You can see why!