'The Sing-Off's' Pentatonix perform 'Carol of the Bells' on 'Conan'

In case you're keeping score, "The Sing-Off" winners Pentatonix are winning the holidays. Their renditions of Christmas favorites "The Little Drummer Boy" and "Angels We Have Heard on High" are enough to melt any heart, but why stop there?

The a capella group appeared on "Conan" in a web-exclusive performance, this time taking on "Carol of the Bells." As they tend to do, the vocal group blows it out of the water with relative ease. At this rate, they'll cover every Christmas carol by December 25.

Photo/Video credit: Team Coco
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