Before the red chairs, before the Adam Levine–Blake Shelton bromance and before The Voice took the country by storm, NBC was home to another hot vocal competition show: The Sing-Off.

Premiering in 2009 as a four-night special holiday event, The Sing-Off became a surprise smash thanks to its mix of strong a cappella performing groups and…

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• Mark Burnett
• Blake Shelton
• Nick Lachey
• Adam Levine
• Ben Folds
• Shawn Stockman
• The Sing-off
• The Voice

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