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https://en.wikipedia.org/wiki/Pitch_class
Used to evaluate atonal and chromatic music. I never used it in music but it came up in one of my mathematics classes in college. I don't remember why.
I sometimes use 1 through 12 or 1 to n mod 12 instead of I to VII.
Other than developing the Groot Scale Computer, I havent found much use for it.

Not sure bout this, but im a firm believer in numbered scale degrees and relationships. keys are a crutch.![]()
There was MUSIC before COMPUTERS.
Just saying...
(0,3,7) is great nomenclature! It clearly denotes that you should play the major and minor triads, in all inversions!Same here. It’s counterproductive to try to force a modern 12-tone chromatic scale into a diatonic framework. Leads to all sorts of odd nomenclature. Especially when naming chords.
(0,3,7) is great nomenclature! It clearly denotes that you should play the major and minor triads, in all inversions!