I suppose it developed initially as a means of communication, whether that was by accident or not I don't know but it really doesn't matter does it? It's discovery must have simultaneously coincided with the uses it could be put to and will then have developed over time according to various other purposes which could be found for it. Over the ages I suppose this ability for the human brain to understand sound has developed and been passed on through genes, so making us very different from the earliest humans. We probably possess far more innate musical understanding than the earliest humans.
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