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I think in a very literal sense the thread is not fit for MO. Mathematics does not attempt to define what music is, so in that regard the question is misplaced. What might be music to one person is may appear as computer-generated trash to another.
There's probably ways in which the thread can be salvaged to be appropriate for MO but it would involve a massive change of focus.
BUT none of the answers given there, nor any answer likely to be given there, is for the question What is music? Until the question is changed, this should not be re-opened.
Not to clutter the comment thread, I will make a brief exception to my meta-absence:
I am with Gerald Edgar and Gil Kalai. The question as asked does not seem reasonable to me, at least not as an MO question. Yet, certainly, there are interesting things to be said on "Mathematics and Music" (there is an entire scholarly journal with that title Journal of Mathematics and Music )
I would thus likely vote to reopen a revised version, say, something asking for mathematical attempts to formalize certain aspects of music. And/or applications of mathematics to the analysis of music and/or app of math to the creation of music. The challenge would be to phrase this well, not to be too broad and vague. (Unfortunately, personally, I feel not competent to do this.)
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