IIRC there is recent research confirming it is at least partially stored in the same are responsible for muscle memory, which supposedly explains quite a few things.

If that is true, the obvious question is why is it stored there?

Well, there are strong ties to movement in music. There is a reason that you don't dance to paintings, literature or poetry.

So one option could be that music arises partly from our motor functions to begin with.

>There is a reason that you don't dance to paintings, literature or poetry.

Ha ha, well put. Although poetry is sort of like music, a bit, at least rhyming poems are. Just looked it up, this article is interesting:

https://en.wikipedia.org/wiki/Rhyme