Jazz emerged from the African-American experience in the United States, so it is not surprising that it has been socially relevant since its earliest manifestations. Sonny Rollins put the matter succinctly: "jazz is protest music."
In 1923, Bessie Smith sang songs based on her experience of racism and sexism. In 1939, Billie Holiday recorded "Strange Fruit," a chilling song about a lynching. Charles Mingus's 1959 classic "Fables of Faubus" secured a permanent place in music history for the…