Exclusive Sneak Peek: The Sing-Off's New Season Is on "Fire"


It's been almost two years since The Sing-Off last serenaded viewers, but the a cappella competition is back and hotter than ever!

In this exclusive sneak peek from Season 4 (Dec. 9, 9/8c), one of the groups blows the judges -- including new addition Jewel -- away with a cover of...




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