My introduction to jazz was in the late '50s. I lived on a farm in central Iowa and the closest record store was 15 miles away. The "jazz section" was 4 bins of stuff. I bought Armstrong Hot Fives, Ellington Columbia lps, Miles and Rollins on Prestige, Gillespie Verves, Bix and adventured on. As I understood it, this was all the same thing. By the time Africa/Brass came out I was ready for any sonic adventure and this has continued all my life. I always thought "jazz" fans were looking for the "new" and dug the past, but about 20 years ago this seemed to shift. Now people seem more interested in "styles" than music. I guess this means the music died.