Love a cappella music? Then the Sing Off is the singing competition for you, and it returns for a fourth season tonight on NBC. Nick Lachey is back as host along with judges Ben Folds and Shawn Stockman of Boyz II Men, along with new judge Jewel, who replaces Sara Bareilles.

With only seven episodes spanning just a couple of weeks, teams will drop fast. Beginning with ten a cappella groups competing for a $100,000 prize and a record contract, the judges will have the bottom two groups compete in an 'Ulitmate Sing Off' at the end of each episode and one will be eliminated.

The finale is set for December 23, and you can watch the premiere tonight on NBC at 8:00 pm CT.

One a cappella group has seen a lot of success following their victory on the Sing Off, maybe you've heard of the Pentatonix. If you haven't check their version of Carol of the Bells: