Christmas comes early with this a cappella version of 'Little Drummer Boy'
You're not officially supposed to listen to Christmas music until after Thanksgiving, but Pentatonix's a cappella cover of "Little Drummer Boy" is worth breaking the rules for.
The five-person singing group, which formed to compete in the NBC a cappella competition show "The Sing Off," recently released its "PTXmas" album for the holidays.
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