“Saturday night is your big night,” reflected the great bluesman Muddy Waters. “Everybody used to fry up fish and have one hell of a time. Find me playing till sunrise for 50 cents and a sandwich.” At their first gig together, Muddy and his friend Scott Bohaner were paid one dollar, given half a pint of moonshine, and each got a fish sandwich.

American violinist Rachel Barton Pine’s Blues Dialogues explores music of Black composers working across blues and classical traditions. Pine was a prodigy, debuting with the Chicago Symphony at age 10. Far from fish sandwiches and moonshine, she has had a celebrated career, and was the International Johann Sebastian Bach Competition’s youngest ever...