The Choir (2009)

Shot over four years, The Choir is the story of Jabulani Shabangu and a group of fellow inmates who are battling to survive in Leeukwop Prison -- South Africa's largest prison. Jabulani is rebellious and angry until he meets a wily old bank robber named Coleman, who recruits him for the prison choir. Jabulani rises in the ranks and leads the choir to victory at the National Prisoner Choir Competition.