You can tell a lot about someone* from the historical year after which they stop listening to jazz. After white folks took it . (1917) Maybe you've an orderly mind ("What is this thing "improv", but anarchy ?") in which case Satchmo goes and ruins jazz as early as 1925. For loads of people it's 1945, where we noticed that, at some point in the Second World War, jazz ceased to be pop music and had donned the unwieldy headgear of art music . ("STOP DANCING AND LISTEN, DAMNIT." - signed, Gillespie, Parker, Monk ) Jazz became agitation, spontaneity, the sound of your nerves . Or there's 1952, when Chet Baker kills the piano (and thus yanks out the moderating seatbelt of standardised chord-accompaniments). What might look like the grandest self-obsession of an egoistic time (1955-63) and place (" Mingus Ah Um "; "Mingus Dynasty"; " Charles Mingus Introduces Charles Mingus "; " Mingus Mingus Mingus Mingus Mingus ...