(THIS BLOG IS STILL IN PROGRESS)
Refs
Circle of Fifths

C Major / a minor
G Major / e minor
D Major / b minor
A Major / f# minor
E Major / c# minor
B Major / g# minor
F#/Gb Major / eb/d# minor
Db Major / bb minor
Ab Major / f minor
Ab Major
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f minor

Eb Major / c minor
Bb Major / g minor
Fb Major / d minor