Pentatonix is an a cappella group of five vocalists, Scott Hoying, Kirstie Maldonado, Mitch Grassi, Avi Kaplan and Kevin Olusola, originating from Arlington , Texas . The group won the third season of The Sing-Off on NBC , singing an a cappella arrangement of " Eye of the Tiger ", originally performed by the band Survivor , as their victory song. Pentatonix won $200,000 and a recording contract with Sony . Their debut EP, PTX Vol. 1 , charted at #14 on the Billboard 200 albums chart. Pentatonix is currently touring and recently released their album, PTX Vol. 2 Pentatonix began with three friends that grew up together: Kirstin "Kirstie" Maldonado, Mitch Grassi, and Scott Hoying at Martin High School in Arlington, Texas . Hearing of a local radio show hosting a competition to meet the cast of Glee , they arranged a trio version of " Telephone " and sent it in. Although they did not end up winning the competition, it sparked attention...