Chord sequence

Abm7, G7, Gbm7, F7

A♭m7 G7 G♭m7 F7

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

Abm7
G7
Gbm7
F7

Analysis

Heard in E major

Each chord's roman numeral and role in E major
Chord	Numeral	Role
A♭m7	♭iv7	Diatonic
G7	subV7/ii	Tritone substitute for V7/ii
G♭m7	ii7	Subdominant
F7	?	Outside the key (bII7)

Progressions in these changes

All the chords

Chromatic iii-bIII-ii-bII Progression in Fb

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