African-American musical artists have long been our teachers, luminaries, and philosophers. What have we learned?

Jon Batiste Performs at Black Lives Matter Rally at Barclays Center, June 12th, 2020. (Gothamist)
The Staples Singers: Wade in the Water. (The Staple Singers)
“Strange Fruit” Billie Holiday. (BillieHolidayOfficial)
Ray Charles performs “Georgia on My Mind” in 1960. (In Choi)