I heard this song the other day and I was kind of in awe at how cool these guys are. I’m sure everyone has heard their version of “Hallelujah” at least a time or two recently. Pentatonix or PTX has been harmonizing since 2011. They first made their mark when they won NBC’s “The Sing-Off,” earning $200,000 and a recording contract. The group has won a Grammy Award for Best Arrangement and Instrumental twice, making them the only a cappella artists to have won the award. Let me tell you, these guys are crazy good, and as Jennifer Lopez would say, they gave me the “goosies,” as in goose bumps. One of my all time favorite Christmas songs is “Carol of the Bells,” and when I heard this song the other day, I freaked out because of how great these guys were. Check it out below, and if you like what you hear, they’ve got a whole Christmas album, “PTXmas” and “A Pentatonix Christmas.”