Eight a cappella groups from around the country assemble to kick off NBC's four-night singing competition. The groups don't use backing bands or tracks but instead use their voices to create a rich and full sound. On hand to critique the performances are celeb judges Ben Folds, Shawn Stockman (of Boyz II Men) and Nicole Scherzinger. But viewers have the ultimate say in who advances as they cast votes for their favorite groups. The winner receives a recording contract and a $100,000 prize.
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