The Sing-Off - Season 4 Episode 3
Eight groups perform their favorite hit.
- ประเภท: Reality
- สตูดิโอ: NBC
- คำสำคัญ: competition, music competition, singer, singing, singing competition, acapella, a cappella
- นักแสดง: Shawn Stockman, Nick Lachey, Patrick Stump, Jewel
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