The acting chief commissioner of prisons, Little Dinizulu Mtengano, said the band came into being when he bumped into a group of musical young prisoners.
Utility can apply to anything from the basic need for food to the pleasure of hearing a favorite song, and will naturally vary for different people and circumstances.
A psychological study of fans of death metal suggests that they are not desensitised to violence despite the genre's association with growling, often graphically violent lyrics including depictions of cannibalism.