Chord sequence

Bbm7b5, Eb7alt, Abm7, Db7, Gbmaj7

B♭m7♭5 E♭7alt A♭m7 D♭7 G♭maj7

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

Bbm7b5
Eb7alt
Abm7
Db7
Gbmaj7

Analysis

Heard in Gb major

Each chord's roman numeral and role in Gb major
Chord	Numeral	Role
B♭m7♭5	iiø7/ii	ii of the ii-V to ii
E♭7alt	V7alt/ii	Secondary dominant of ii
A♭m7	ii7	Subdominant
D♭7	V7	Dominant
G♭maj7	Imaj7	Tonic

Progressions in these changes

All the chords

Minor ii-V to ii-V-I Progression in Gb

A minor ii-V aimed at the ii chord, then the ii-V-I: the ii is approached as if it were a key of its own.

Scales to play