The Sing-Off - Season 4 Episode 2
The nine remaining groups perform party anthems.
- ประเภท: Reality
- สตูดิโอ: NBC
- คำสำคัญ: competition, music competition, singer, singing, singing competition, acapella, a cappella
- นักแสดง: Shawn Stockman, Nick Lachey, Patrick Stump, Jewel