Kevin Whitehead

Jazz has always drawn on the syncopated rhythms of Cuban music, and occasionally draws on other new world strains, like Brazilian bossa nova in the 1960s. But that interaction between North and South is ongoing.

Julius Hemphill's "Dogon A.D." — the 15-minute piece, and the album that's named for it — was one of the startling jazz recordings of the 1970s, a rethinking of possibilities open to the avant-garde. In the 1960s, free jazz was mostly loud and bashing, until some Chicagoans began playing a more open, quieter improvised music. That inspired St. Louis players like Hemphill, who also had ties to heartland rhythm-and-blues scenes. Hemphill's genius was to combine the Chicagoans' dramatically spare sound with a heavy backbeat. His new urban music smacked of old country blues.