Season Premiere Wednesday December 17 9/8c. America's favorite a capella show is back! Just in time for the holidays, "The Sing-Off" returns as the country's top a capella groups head to Hollywood for the singing competition with a soul all its own. Fall Out Boy front man Patrick Stump joins returning judges Jewel and Shawn Stockman, with Nick Lachey ("The Winner Is") once again set as host.

Each group will perform show-stopping numbers like you've never seen or heard before, with no lip-synching, backup bands or safety net. They'll be covering all your favorites from today's top pop chart, to R&B, rock, country and more. It's "hit the right notes or go home" in this competition, as the celebrity judges critique the performers and eliminate one group each week. The last group standing will be awarded a cash prize and an Epic Records/Sony Music recording contract. Now that's something to sing about! One-hour alternative series.

Last year's "Sing-Off" champions Home Free saw their recent album release "Crazy Life" go to #1 on the country iTunes chart and #4 on the overall iTunes chart. They embarked on a 36-show tour in support of the album and have appeared on shows such as "Today" and "Fox & Friends."

As another sign of the influence of "The Sing-Off," Pentatonix has become a musical force since winning the third season. Since debuting in 2011, the quintet has released four EPs and a full-length holiday CD, "That's Christmas to Me," selling more than 600,000 copies, with three of the releases debuting in the Top 10 on Billboard's Top 200 chart. Having recently eclipsed 6.6 million subscribers and over 625 million cumulative views, the Pentatonix official YouTube page is currently the 13th most subscribed-to music channel, having surpassed the subscriber totals of both Avicii and Beyoncé.

"The Sing-Off" is produced by United Artists Media Group (a joint venture among MGM, Mark Burnett, Roma Downey and Hearst Corporation) along with Outlaw Entertainment and Sony Pictures Television.

Mark Burnett (NBC's "The Voice") is the executive producer. Deb Newmyer, Sam Weisman and James Sunderland are also executive producers.

Each group will perform show-stopping numbers like you've never seen or heard before, with no lip-synching, backup bands or safety net. They'll be covering all your favorites from today's top pop chart, to R&B, rock, country and more. It's "hit the right notes or go home" in this competition, as the celebrity judges critique the performers and eliminate one group each week. The last group standing will be awarded a cash prize and an Epic Records/Sony Music recording contract. Now that's something to sing about! One-hour alternative series.