There's an a capella group called Pentatonix who posted a cover of “Little Drummer Boy” on YouTube on November 25th and in less than a week, it's become a viral sensation.

Since uploading the music video to YouTube, the song has had over 8 million views and is one of the best versions of "Little Drummer Boy" that I've ever heard. I love the emotion, the sound, the arrangement-all of it! Take a listen and if you like it, you can download the group's Christmas album on iTunes.

But wait! There's more. I'm seriously addicted to Pentatonix- their sound is flawless and breathtaking. Here's some more of their work:

I just can't stop listening to these guys.  Here's one last song for you and it happens to be one of Glenn Pitcher's favorite songs: