Staples began singing with her family as a teenager. The Staple Singers started out in gospel, but moved over to pop, eventually playing the '69 Harlem Cultural Festival. Originally broadcast in 1989.
Masekela, who died in 2018, was a symbol of South Africa's anti-apartheid movement. He performed around the world, including at the 1969 Harlem Cultural Festival. Originally broadcast in 1988.
The renowned bluesman, who died in 2015, spoke to Fresh Air in 1996 about growing up as the son of a sharecropper — and leaving the plantation as a young man to pursue a career in music.