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"The Sing-Off" finale: Who will win the competition?

From left, "The Sing-Off" host Nick Lachey and judges Sara Bareilles and Ben Folds speak on Aug. 1, 2011 in Beverly Hills. Getty Images

(CBS) America's favorite a cappella group will be chosen Monday night (Nov. 28) in the live season finale of NBC's "The Sing-Off."

Three groups remain: The Dartmouth Aires (Dartmouth College's oldest a cappella group), Pentatonix (a five-member group originally from Arlington, Texas) and Urban Method (eight studio musicians who previously never sang together). They will perform one last time in hopes of winning the hearts of Americans.

The winning group will take home a $200,000 prize and a recording contract with Sony.

Judges Ben Folds, Shawn Stockman and Sara Bareilles will chime in during the final competition, hosted by Nick Lachey.

The finale will include special appearances by singer Smokey Robinson and rapper Flo Rida.

Stockman, who's a member of the vocal group Boyz II Men, offered some advice to the finalists. "It's very simple in theory," he recently told Zap2It. "To sing, you need to breathe. You need oxygen. The less oxygen you have, the less likely you are to be on key. The more oxygen you push out, the more you breathe in."

The season three finale of "The Sing-Off" will air from 8-10 p.m. ET on NBC.

Tell us: Who will win season three of "The Sing-Off"?

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