Pentatonix Sing "Angels We Have Heard on High" LIVE at #Tubeathon

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A cappella supergroup Pentatonix ("The Sing-Off") perform the holiday classic "Angels We Have Heard on High" to open the 1st Annual Tube-a-Tweet-a-Thon LIVE from Hollywood. SUBSCRIBE for more exclusives: http://full.sc/NfhdwD

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At the first annual Tube-a-Tweet-a-Thon, presented by What's Trending and Virgin Mobile, Pentatonix performs the Christmas favorite "Angels We Have Heard on High." It's the first track off of their new holiday EP, "PTXMas," available now on iTunes and Amazon. The group is introduced by G4 and NBC's Alison Haislip and NASA's "Mohawk Guy," Bobak Ferdowsi.

Pentatonix are Scott Hoying, Kirstie Maldonado, Mitch Grassi, Avi Kaplan and Kevin Olusola, and they will change the way you think about singing without instruments. They won the third season of the NBC competition "The Sing-Off," boosted in part by their stellar rendition of Survivor's "Eye of the Tiger," and earning $200,000 and a recording contract with Sony.

BUY "PTXMAS": http://www.amazon.com/PTXmas/dp/B009ZAY8MM
SUBSCRIBE TO PENTATONIX: http://youtube.com/ptxofficial

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