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28 प्रकरण
The Sing-Off - Season 4
- साल: 2014
- देश: United States of America
- शैली: Reality
- स्टूडियो: NBC
- कीवर्ड: competition, music competition, singer, singing, singing competition, acapella, a cappella
- निदेशक:
- कास्ट: Shawn Stockman, Nick Lachey, Patrick Stump, Jewel