casaerwin ___ IF... I take the 'Circle / Out', and line the 5ths, and 4ths, in a vertical pattern, is there useful information there? / Or, am I looking for something, that isn't there?, other than the number of 'flats, and 'sharps, are equal.
F G = 1
Bb D =2
Eb A =3
Ab E =4
Db B =5
Gb/F#=6 ( b's - #'s )
'If, I am Playing a 'Backing Track' of 'E' Mixolydian, and I decide the 'Pitch' register is too high.
As 'E' is #3, in the sequence of Modes, I count a, 3rd back from 'C' Ionian, and land on 'Ab, and start playing 'Ab Major, the notes, sound compatible.