m7 only any key practice.

all chord has minor chord.
Every day practice memory minor 7th chord.
6th change is 7th half note down.

○harmony method.
bass down is up inversion chords.
bass up is down inversion chords.

move image
bs← →chord
bs→ ←chord

NG harmony method move restriction.
parallel 5 and 8 movement.
bs→ →chord
bs← ←chord

but move restriction than priority on hold note.