The a cappella group Pentatonix sing like angels together in the song "Angels We have Heard On High." The group will be performing two shows in Mobile, Alabama, this weekend with the Mobile Symphony Orchestra, which may be the last opportunity to hear them sing Christmas songs live -at least this year. You can sample their Christmas album at iTunes. -via Viral Viral Videos
I like The Coats' rendition better. No lip-syncing. No echo-effect. No dubbing. Just 4 guys singing in real-time:
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