Marvin Gaye walks ahead of his Rolls Royce in Notting Hill, London, in 1976. John Minihan/Getty Images hide caption

itoggle caption John Minihan/Getty Images

The Freedom Singers make several appearances in our mix of songs inspired by the civil rights movement — a collection that ranges from 1963 to the present day. Joe Alper hide caption

itoggle caption Joe Alper

Marvin Sapp performs at the How Sweet the Sound national gospel competition September 29 ,2008 in Chicago, Illinois. Tasos Katopodis/Getty Images hide caption

itoggle caption Tasos Katopodis/Getty Images

Malian singing legend Oumou Sangare performing in Essaouira, Morocco in June 2012. Fadel Senna/AFP/Getty Images hide caption

itoggle caption Fadel Senna/AFP/Getty Images