Lacking a point of reference, the word 'music' is interchangeable with 'noise'. Consider your query as if read by one who had been deaf right out of the womb.

forgive the presumption, I'm new to this whole thing in many ways, but I have a feeling you either did not read or did not understand the 'map and territory' sequence. Perhaps this would help you answer your own question.

http://wiki.lesswrong.com/wiki/Map_and_Territory

That's not the right question. In order for facts to be useful, they must connect to something. Music is not a fact, except in the sense that "Music exists, therefore I expect to hear it under this circumstance."

Math is an expression of what is constantly happening around us. Music is a thing, not a belief. "What good is Music?" Well, what good are trees? What good is love?

You put music into the wrong catagory. Music is a thing, not a belief.