PTX, Vol. 1

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 November 28, 2011 broadcast on NBC.
The group derives its influences from pop, dubstep, electro, reggae, and hip-hop. As of January 2012, they have been releasing music videos. Their much-anticipated EP, "PTX Vol. 1", was released on June 26, 2012, charting at #14 in the US Billboard 200 :. It sold 20,000 copies in its first week of release.