Merry PTXmas! Pentatonix Perform Their Holiday Hit at Yahoo

During their run on the a cappella talent show "The Sing-Off" in 2011 Pentatonix (Mitch Grassi Scott Hoying Avi Kaplan Kirstie Maldonado and Kevin Olusola) placed no fewer than 11 songs in the top 10 Soundtracks chart on iTunes After their win their YouTube channel went on to rack up...

by via RollingStone.com: Music News