Hugh Masekela's career as a musician has been dominated by his determination to take the music of black South Africans to the rest of the world. His music is a fusion of sophisticated jazz and the raw but melodic Mbkanga, which is to the townships of South Africa what reggae is to Jamaica. As he became more successful Masekela left South Africa and spent the next 25 years in self-imposed exile in America, vowing never to return until the apartheid regime had ceased. In fact last year he did return - not to South Africa, but to Gaberone, Botswana, just a few miles from the border. Here he has set up a mobile recording studio which has become a magnet for the explosive music of his homeland.