The holiday season is just around the corner and we'll be expecting some people caroling right outside our doorsteps. As everyone of us has our own favorite holiday songs, this well-known and talented group sung one of many's all-time Christmas song favorites.

The group known as Pentatonix or PTX is an a cappella group that consists of five vocalists originating from Arlington, Texas. Most of their works consist of covers of existing songs along with some original material.

The a cappella group were formed and found fame in 2011 by winning the third season of The Sing-Off on NBC. Their victory earned them $200,000 and a recording contract with Sony Music.

Watch and enjoy the group's amazing cover of "Mary, Did You Know?" below.

Tags: Pentatonix The Sing-Off nbc Mary Did You Know