The two youthful groups sing off to the smash hit "Survivor" by Destiny's Child.
The Princeton University group talks up the stiff Sing-Off competition.
The Filipino heartthrobs of The Filharmonic amp up the energy to Maroon 5's "One More Night."
The group details how they came together.
America's top a cappella groups compete for the ultimate prize - a recording contract and $100,000!
Element shines with The Supremes' Motown classic "You Keep Me Hangin' On."
The college boys take on the Bob Seger staple - and iconic "Risky Business" song - "Old Time Rock & Roll."
The country group performs chick-flick favorite - and Roy Orbison hit - "Oh, Pretty Woman."
Ten tackles atmosphere with Adele's Oscar-winning song, "Skyfall."
The judges make their first elimination of Season 4 and send one group home.
The group reveals the secret behind their slick choreography.
The four remaining groups cover Florence + the Machine's hit, "Shake It Out."
The group unveils the man behind its incredible arrangements.
Ten and The Filharmonic express themselves after the results.
The groups and judges make fun of their favorite Sing-Off judge-isms.