Check out this video from Pentatonix, an a cappella group of five vocalists: Scott Hoying, Kirstie Maldonado, Mitch Grassi, Avi Kaplan and Kevin Olusola, originating from Arlington, Texas. The group was the winner of season 3 of NBC’s The Sing-Off, taking instrument-free music far beyond anyone’s wildest expectations. Named after the world’s most widely recognized five-note musical scale, this vocal quintet has transformed one of pop music’s purest and most soulful expressions into an exciting future, filled with limitless sonic possibility.