Season 2, Episode 3 The Sing-off
First Aired: December 13, 2010
The groups perform rock songs and guilty pleasures, and collaborate to sing Green Day's "21 Guns."
Cast & Details See all »
- Premiered: December 14, 2009
- Rating: TV-PG
- Premise: Eight a cappella groups from around the country compete for a recording contract and $100,000. (more)