Pentatonix on Katie Couric Top Tunes of 2012 Medley

On the 2012 episode of her talk show, Katie Couric invited Pentatonix to perform a medley of the year s top 5 most shared songs on facebook. Check out Pentatonix performing their a cappella arrangement of Gangnam Style live for Katie Couric here: PTX also performed Angels We Have Heard On High from their new holiday EP PTXmas in the Katie green room, which can be viewed here: