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Jonathon
A thought about your mention of harmonic tunings. Apart from such dada-esque or musique concrete-like musical forms such as Chinese Opera of the Japanese GaGaKu virtually all the world's music conforms to the same mathematical structure. Just about every culture we discover has one common musical element, the pentatonic scale. From this basic scale all of the various music systems develop.
There is only one pentatonic scale and it is defined by the overtone numbers that comprise it. These are 1, 9, 5, 3, 27.
The difference between the East Indian scale and the western scale is the major sixth. The western scale is a reciprocal scale (I explain this in my Structural Resonance papers) and the major sixth is the ratio is 5/3. The Eat Indian scale which is not reciprocal and usually sounds over a drone requires the major sixth ratio to be 27/16. Apart from that the scales are identical but their functions are quite different.
Tom