I meant not that the pitches themselves aren't in nature...what I mean is that the A we use was not an "A" in Baroque music, and is not the same as "dha," the 6th degree of the Indian scale, which is pitched sharper than Western music. My point being that A 440 does occur in nature, but a hummingbird doesn't know it's an A because the Greeks (I believe) invented the diatonic system, and that system is the one we have to work with in regard to "perfect pitch." In other words, you can't be born being able to sing an A on command - you have to learn what A is before your mind can do that.
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