‘Little Drummer Boy’ – Pentatonix

Via: Pentatonix Mitch Grassi, Scott Hoying, and Kirstie Maldonado formed a trio during high school together in Arlington, Texas. They added the final two members, Avi Kaplan and Kevin Olusola, the day before their audition on Season 3 of NBC’s “The Sing-Off”, and PTX was born. Pentatonix has that special acappella swag, something that most singing groups tend to lack. Youtube: Pentatonix

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