Very interesting topic, I've thought a great deal about this. To know anything, the easiest approach is to know its history and understand/recognize patterns etc. So taking that route to the very extreme; the existence of music (?)

One Idea that came to me was, when there were two things time was born, you know.. you could measure one against the other etc. And the creation of time could also mean the creation of music.. What else could it have been?

Now was music created as an expression or has it been adopted by humanity to be so, that is something I would really like to know..I do believe that it is a very complicated and deep form of expression.

Sorry about the length..