Evolution of Music - by Pentatonix

Pentatonix, an A Cappella group of five vocalists from Arlington, Texas is taking instrument-free music far beyond anyone’s wildest expectations. The members of the band are vocalists Scott Hoying (21), Kirstie Maldonado (20) and Mitch Grassi (20), vocal bass Avi Kaplan (23) and beatboxer Kevin “K.O.” Olusola (24).

Their song "Evolution of Music" was published on YouTube on April 18, 2013 and is gaining popularity. Below is a song by the group.