Overtone

Overtone was an a cappella/vocal band that made its debut in 2006 and originated from Johannesburg, South Africa, best known for their performance on the Invictus soundtrack and their connection with Clint and Dina Eastwood. From Wikipedia (https://en.wikipedia.org/wiki/Overton...) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/b...)