former brain scientist weighing in here. the brain seems to do some operations which resemble Fourier transforms. We also use logrithmic scaling. Combine those

former brain scientist weighing in here. the brain seems to do some operations which resemble Fourier transforms. We also use logrithmic scaling. Combine those two and you get a lot of the harmonics. So yes, you ask a good question, but in fact there is some knowledge of the hardware which supports the empirical observations of musicians and composers. and yes, music is still a mystery. There is a lot more going on than scale, pitch, and harmonics.