South African rapper Cassper Nyovest, Nigeria's Banky W, Cameroonian singer Wax Dey, Runtown, Simphiwe Dana, and Shaydee get together for the Nelson Mandelatribute track "Viva Mandela, Tata Madiba." The song, which is currently only available on MTN Music Plus and MTN caller tune downloads in South Africa, will be officially released on July 18 for International Mandela Day, with part of the sales proceeds going to a charity picked by the Nelson Mandela Foundation. Stream a preview of "Viva Mandela, Tata Madiba," produced by Angola's O'Magic, below. For more, revisit our Nelson Mandela: A Life In Music feature and BLK JKS member Tshepang Ramoba's 67-minute Mandela Day mix.