The judges weigh in on which group to save - The Filharmonic or Street Corner Renaissance.
Theme park group VoicePlay sings Pitbull's "Feel This Moment."
The Sing-Off contestants riff on the highlights from every musical generation.
acoUstiKats mix it up with "Hey Ya" by Outkast.
The girl powerhouse rocks out to "Raise Your Glass" by Pink.
Filipino boy band The Filharmonics serenades with "Treasure" by Bruno Mars.
Host Nick Lachey and executive producer Mark Burnett talk about why they love The Sing-Off.
The Filharmonic sings for redemption with the Aerosmith classic from "Armageddon."
The Sing-Off contestants give the recipe for a surefire hit song.
Survivor's "Eye of the Tiger" takes center stage for one of the night's Ultimate Sing-Offs.
Ten and The Filharmonic express themselves after the results.
A special holiday reunion performance by 98 Degrees leaves all the ladies screaming.
The teenagers in the competition's youngest group talk about performing for the judges.
The competition's youngest group, Vocal Rush, powers through "Bottom of the River" by Delta Rae.
Vocal Rush teases out the '80s with Bonnie Tyler's hit "Holding Out for a Hero."
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