Pentatonix

Pentatonix is an American 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 in 2011, singing an a cappella arrangement of "Eye of the Tiger," which was 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 (2012), charted at #14 on the Billboard 200 and their second release, PTX Vol. 2 (2013), debuted #10 on the Billboard 200 and #1 for Independent Albums. They have sold over 500,000 records.

On June 25, 2014, Entertainment Weekly reported that the group will join the cast of the a cappella-centric film Pitch Perfect 2, slated for 2015. - Wikipedia