The Princeton University group talks up the stiff Sing-Off competition.
Survivor's "Eye of the Tiger" takes center stage for one of the night's Ultimate Sing-Offs.
Vocal Rush slows it down with the Phil Collins hit, "Against All Odds."
Pentatonix returns to show America what earned them Season 3's Sing-Off crown.
Vocal Rush and Ben Folds shine in their performance of the Bing Crosby/David Bowie classic.
The members of Calle Sol swing their hips to "Livin' La Vida Loca" by Ricky Martin.
Jewel joins Nick on stage for a lovely rendition of the pop classic.
Vocal Rush and Ten shoot for glory during an Ultimate Sing-Off to Irene Cara's "Fame."
The Sing-Off contestants chat about their favorite movie genres.
The legendary Pat Benatar and Neil Giraldo are backed by Sing-Off contestants.
VoicePlay channels Wild Cherry's 1972 hit "Play That Funky Music."
The group reveals the secret behind their slick choreography.
The judges make their selection and crown a new champion for Season 4.
Home Free sprints to the finish line with Hunter Hayes' "I Want Crazy."
Street Corner Renaissance performs "What Makes You Beautiful"
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