Joel Gallen

"The Sing-Off Holiday Special" will be filled with holiday and inspirational songs performed by the winning groups from all three seasons, a compilation of lead singers from season three, a collegiate ensemble and special guests.

"The Sing-Off Holiday Special" will be filled with holiday and inspirational songs performed by the winning groups from all three seasons, a compilation of lead singers from season three, a collegiate ensemble and special guests.

The final three groups perform for the last time before finding out who America voted as the country's best a capella group. Special performances by groups seen on this season will round out this finale night episode. The winning group receives the prize of $200,000 cash and a Sony Music recording contract. Nick Lachey hosts and Sara Bareilles, Ben Folds and Shawn Stockman serve as judges. Also available on Amazon Instant Video and VUDU

The final four groups take the stage for the final time before America votes on a winner with a massive mash up opening performance of The Who's "Baba O'Reilly," The Verve's "Bittersweet Symphony," Katy Perry's "Last Friday Night (T.G.I.F.)" and Gwen Stefani's "Hollaback Girl." Later they take on mashing two hit songs together before performing a song of the judges' choice. One more group is sent home, leaving the final vote for a cappella champion to America. The group that remains standing at the end of the season receives the prize of $200,000 cash and a Sony Music recording contract. Nick Lachey hosts and Sara Bareilles, Ben Folds and Shawn Stockman serve as judges. Also available on Amazon Instant Video and VUDU