Chord sequence

Am7, Ab7, Gm7, Gb7

Am7 A♭7 Gm7 G♭7

Tempo 120 BPM

Rootless Shells Guide tones Rooted shells Rooted Drop 2

Four-note rootless voicings in their two forms, with the 3rd or the 7th on the bottom, played over the root.

Customize each chord

Am7
Ab7
Gm7
Gb7

Analysis

Heard in F major

Each chord's roman numeral and role in F major
Chord	Numeral	Role
Am7	iii7	Diatonic
A♭7	subV7/ii	Tritone substitute for V7/ii
Gm7	ii7	Subdominant
G♭7	?	Outside the key (bII7)

Progressions in these changes

All the chords

Chromatic iii-bIII-ii-bII Progression in F

The iii-VI-ii-V turnaround with both dominants replaced by tritone substitutes, so the roots descend by half steps from iii to I.

Scales to play