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.

They performed at private functions, corporate events, and various music festivals including Aardklop, Innibos and the Klein Karoo Nasionale Kunstefees.

After singing a few songs in their green room, OneRepublic invited Overtone to open for them at their show later that evening at The Troubadour in West Hollywood and at a tree lighting ceremony the following day at the Americana mall.

[citation needed] Overtone has featured as the opening act on the west leg of Corinne Bailey Rae's The Sea Tour, performing in Vancouver, Portland, Seattle and San Francisco.

In joint efforts with many top South African artists Overtone performed at the "Hoop vir Haïti-inisiatief" (Hope for Haiti Initiative)[6] concert to help raise funds for the victims of the 2010 earthquake.