Here are a few more esoteric music theory links.
This stuff is dense, but give it a chance. It will open up your entire musical perspective. Musicians used to be taught the philosophic and mathematical foundations of music as part of their education. Music wasn't always just for cocktail enhancement and booty stimulation.
Harmonic Theory and Just intonation
Syndex:A synergetic perspective on number dynamics -written by my close friend Iona Miller
Ancient concepts of number
Islamic musical theory
The Just Intonation network
Just Intonation Explained