In 1893 the composer Anton?n Dvor?k prophesied a "great and noble school" of American classical music based on the "negro melodies" he had excitedly discovered since arriving in the United States a year before. But while Black music would foster popular genres known the world over, it never gained a foothold in the concert hall. Black composers found few opportunities to have their works performed, and white composers mainly rejected Dvor?k's lead. Joseph...