The original question is difficult because it presupposes that we can define "jazz" without great difficulties. We can't. However, may I suggest that if we try there are are certain elements involved in the definition that are extra-musical, social and historical. That is the reason why it is silly to call Mozart or Brahms "jazz". I'm suggesting that musical categories are not just about sounds - they're also about social organisation and all the usual stuff that encourages humans to define themselves in particular ways.
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