1 min readMar 22, 2020
Inner most ring is for interval
>M for major interval
> m for minor interval
Outer most ring is for Chords
> Green for major(big Roman numeral),
> blue for minor(small Roman numeral)
> red for diminished(small Roman numeral)
In your image,
> I, IV, V are major chords
> ii, iii, vi are minor chords
> vii is diminished chord.
For example,
If you select C major chord(I), the inner most ring shows you intervals related to chord I as 1,M3,5 and center ring with keys as C,E,G
If you select D minor chord(ii), the inner most ring shows you intervals related to chord ii as 1,m3,5 and center ring with keys as D,F,A