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I mention a bit of the controversy of jazz and blues being affiliated with race music here: https://www.reddit.com/r/AskHistorians/comments/3x3u31/in_recent_history_rap_rock_and_roll_and_jazz_were/
and some more depth here: https://www.reddit.com/r/AskHistorians/comments/40o0we/how_did_jazz_become_classy/