It looks like the author is applying Set Theory [1] and concepts from 12-Tone [2] to tonal music. It is an interesting exercise - though I would expect that thi

It looks like the author is applying Set Theory [1] and concepts from 12-Tone [2] to tonal music. It is an interesting exercise - though I would expect that this music essentially boils down to "Tonic -> Domainant" relationships. Schenker would be proud :) [1] https://en.wikipedia.org/wiki/Set_theory_(music) https://en.wikipedia.org/wiki/Set_theory_(music) [2] https://en.wikipedia.org/wiki/Twelve-tone_technique https://en.wikipedia.org/wiki/Twelve-tone_technique