The Sing Off Is Back!
Episode: 4x01 | Airdate: Dec 9, 2013
Episodes
Party Anthems
Episode: 4x02 | Airdate: Dec 11, 2013
# 1 Hits
Episode: 4x03 | Airdate: Dec 12, 2013
My Generation
Episode: 4x04 | Airdate: Dec 16, 2013
Movie Night
Episode: 4x05 | Airdate: Dec 18, 2013
Judge's Choice
Episode: 4x06 | Airdate: Dec 19, 2013
4th Season Finale
Episode: 4x07 | Airdate: Dec 23, 2013
Specials
Holiday Edition
Episode: S04 Special | Airdate: Dec 17, 2014