I've got a fairly reasonable knowledge of the technical ins and outs of music theory/acoustics, so I know
how these things are created, how they interact etc etc.
As to
why they work in the way they do - do you know what? I don't want to know. There are some things in life I'm just happy to accept that simply, well, just
are.
Music IMHO is possibly the single greatest thing humans have ever produced or can experience, and I'm quite happy for it to retain a certain degree of mystery, it's about the one thing on earth that would sadden me if reduced to a simple* formula.
*or more likely, not so simple