Sam Weisman Videos

Pentatonix return to THE SING-OFF stage for last night's finale and showed America what earned them Season 3's Sing-Off crown.

Pentatonix returned to THE SING-OFF stage for last night's finale and showed America what earned them Season 3's Sing-Off crown. Below, watch the group perform Calvin Harris' and Ellie Goulding's 'I Need Your Love.'

Emerging as the victors was professional country group Home Free, consisting of Austin Brown, Rob Lundquist,Chris Rupp, Tim Foust and Adam Rupp.

Ten talented a cappella groups from across the country competed for the grand prize, including old school harmonizers Street Corner Renaissance who crooned their version of One Direction's 'What Makes You Beautiful.