Bela Bartok's axis system

For any given Key, the Béla Bartók¿s axis system allows us to clasify the 24 Major and minor chords into 3 groups of 8 chords: one group having the Tonic function, another the Dominant function and the other the Subdominant function. The 8 chords in each group are found by looking for relative and parallel chords from a starting chord. Representing those groups on the Harmonic Wheel is very simple: each of them takes up a circular sector. Nuño Fernández, L. (2016). Bela Bartok's axis system. http://hdl.handle.net/10251/66767