Have you seen Pentatonix from The Sing Off? See them sing “Royals” and “Little Drummer Boy”

This group uses no instruments and may be the best A Capella group ever – love their renditions of the “Little Drummer Boy” and “Royals”. They won season three of The Sing Off. The “Little Drummer Boy” already has over 23 million views on You Tube! NBC finally might have scored true stars from one of their singing competition shows.

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