10.33Hear C minor → E♭ major

Play:

Cm9

then:

E♭maj9.

They share many tones:

Cm9: C E♭ G B♭ D

E♭maj9: E♭ G B♭ D F.

Four common notes:

E♭ G B♭ D.

Only the bass/one color changes.

Yet the tonal feeling shifts significantly.