sing off final 3 'The Sing Off' winner: Pentatonix tunes out Dartmouth Aires and Urban MethodOn Monday (Nov. 28), the Season 3 winners of “The Sing-Off” were announced.

It wasn’t much of a surprise — Pentatonix have been the front-runner for several weeks now. Though both were “on the edge of glory” tonight, as Nick Lachey said, Pentatonix won! Members of the group dropped out of school in the hopes of winning the $200,000 Sony recording contract, so they were probably beyond relieved when Lachey called their names.

Though they took the stage first, it was a big night for all three finalists.

Pentatonix was featured first. They had chosen to dedicate some time this week to the Los Angeles based charity The Trevor Project, which combats teen bullying and gives bullied teens a place to turn when they’re troubled. After their package, they took the stage, singing David Guetta’s “Without You.” Ben Folds commended them on their “butt-shaking bass” singers.

Later, Pentatonix had the distinguished honor of performing “Give Me Just One Night (Una Noche)” one of 98 Degrees’ worst songs which Lacey called “one of the legendary songs of modern music,” with Lachey himself. Afterward, Lachey joked, “That took me back. I think when this whole thing’s over and things calm down a little bit, we should hit the road together. I’m available. Call me.” We smell sadness.

The Urban Method chose the Sickle Cell Foundation as their charity, because Kim Dawson’s sister suffers from the genetic disease. The Foundation gives children with sickle cell confidence and a sense of community. They picked “Stereo Hearts” by Gym Class Heroes ft. Adam Levine as their finale song. Sara Bareilles particularly commended the female singers, saying, “We have seen you guys grow so much.”

Later, they performed with Bareilles, adding a hip-hop a cappella twist to her single, “Gonna Get Over You.” “This group is a very charismatic group and they have a ton of heart,” she said in the package. “It’s a total treat for me to get to take the stage with such a stellar group.” While she rehearsed in glittery pumps, she and the girls traded their heels for sock-hop friendly sparkled sneakers for the actual performance.

The final group to perform was the Dartmouth Aires. They chose Meat Loaf’s classic “Paradise by the Dashboard Light,” and lead singer Michael was joined by Amy Lynn from Delilah for the Ellen Foley parts. Shawn Stockman applauded the group’s charity work with Saving Strokes, an organization that offers rehabilitation to stroke victims through golf.

Folds and the Dartmouth Aires then turned the studio into an “a cappella freakshow,” splitting the audience into a three-part harmony for Ben’s song “Not The Same” from his 2001 album, “Rockin’ the Suburbs.”

After lots of extra performances (get to the good stuff, people!) the first eliminated group was Urban Method. They were commended on their street style and credited with transforming the competition. “We leave the stage tonight humbled and grateful,” Mike said. “Much love to all of our family and friends. Thank you very much. I love my team and we love y’all.” Their swan song was Diddy and Skylar Grey’s “I’m Coming Home,” which Kim sang through her tears.

The Dartmouth Aires didn’t sing us out, but they did applaud from the sidelines as Pentatonix sang “Eye of the Tiger.”