4 episodes · 2009

The first season of The Sing-Off premiered on December 14, 2009. The show featured eight a cappella groups performing popular songs live. The winner's prize was $100,000 and a Sony Music recording contract. Nick Lachey hosted, while Ben Folds of Ben Folds Five, Shawn Stockman from Boyz II Men and Nicole Scherzinger from The Pussycat Dolls were judges. The show ran for 4 episodes, concluding on December 21, 2009 with a live finale. The group Nota won the title.

5 episodes · 2010

The second season of The Sing-Off premiered on December 6, 2010. The number of a cappella groups was increased from 8 to 10, with all acts coming from the United States. Nick Lachey was kept as host for the new season, and the three judges Ben Folds, Shawn Stockman and Nicole Scherzinger also returned. The program aired for 5 nights in December, and its finale was on December 20, 2010. The season premiere averaged 8.5 million viewers. On the finale, the group Committed became the second champion of the show, beating out Street Corner Symphony, The Backbeats, and Jerry Lawson & Talk of the Town. This was Scherzinger's final season as a judge.