Stephen Sackur speaks to South African musician and campaigner Yvonne Chaka Chaka. She was raised in poverty in Soweto under apartheid but her ability to sing gave her a route out. Her songs, celebrating the pride and strength of black South Africa, became favourites of Nelson Mandela. After 30 years of recording and touring, she is known as the 'princess of Africa'. How does she feel about the changes she has seen? Show less