The Sing-Off
Episode 4 (2x4)
Data emisji: Gru 15, 2010
The five remaining groups come together for a performance; each group sings a medley of songs by a single artist; the judges choose the contestants' next assignment.
- Premiera: Gru 2009
- Odcinki: 29
- Obserwujący: 162
- Zakończony
- NBC
- Poniedziałek w 20