The Sing Off Is Back! The Sing-Off : Season 4 Episode 1
NBC 2h 00m
Aired: December 9th, 2013 @ 8:00 PM EST on NBC
The groups try to make a good first impression on the judges.
NBC 2h 00m
Aired: December 9th, 2013 @ 8:00 PM EST on NBC
The groups try to make a good first impression on the judges.
