"The Sing-Off is a five-night event, hosted by multi-platinum recording artist Nick Lachey, culminating with a live finale. Celebrity judges who will critique the singing groups with their expertise are Ben Folds (Ben Folds Five), Shawn Stockman (Boyz II Men), and Nicole Scherzinger (The Pussycat Dolls). The show will feature the country's top ten a cappella groups performing popular songs like you've never heard them before. There's no lip-synching, backup bands, or safety net. They'll be singing for America's vote, with the winner walking away with the ultimate prize – a Sony Music recording contract and $100,000.
The Sing-Off is produced by Joel Gallen's (America's Best Dance Crew) Tenth Planet Productions, Outlaw Entertainment, and Sony Pictures Television. Joel Gallen, Deb Newmyer, and Sam Weisman are executive producers. Josh Greenberg serves as co-executive producer." -- iTunes Store
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Ten a capella groups from around the country step onto "The Sing-Off" stage for the first time to compete for the ultimate prize, a recording contract and $100,000. Nick Lachey hosts while the groups come together as one to sing Kiki Dee’s "I've Got the Music in Me" in addition to individual performances of the groups’ choice. Celebrity judges Ben Folds, Shawn Stockman and Nicole Scherzinger will decide which two groups won’t make the cut.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.