i think the big blind spot most research like this has is that they focus on the abstractions on music- "harmony" in particular. music becomes so much more interesting when you realize the practicalities of the instruments, coordination of musicians and circumstances of listening etc drive the music as much as anything. the music encodes all this. notice how different genres have different instruments, different band sizes, different performance customs, different societal status, different harmony, melody, rhythm, texture etc? focusing on harmony is fun, but its over analyzed because its math bait