This is Pentatonix. They’re an a capella group which surfaced on Season 3 of The Sing Off, an NBC TV show. They won first prize in 2011 and received $200,000 and a Sony recording contract. The members first met as a group the day before the auditions for the show. That’s pretty remarkable.

Here they are singing “Little Drummer Boy,” which everyone hates. But sung a capella it’s got a different feeling altogether, so give it a try.