Chord sequence

Bbmaj7, Gm7, Ebm7, Ab7

B♭maj7 Gm7 E♭m7 A♭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

Bbmaj7
Gm7
Ebm7
Ab7

Analysis

Heard in Bb major

Each chord's roman numeral and role in Bb major
Chord	Numeral	Role
B♭maj7	Imaj7	Tonic
Gm7	vi7	Diatonic
E♭m7	iv7	Borrowed from Bb minor
A♭7	♭VII7	Borrowed from Bb minor

Progressions in these changes

Chords 3 to 4

Major ii-V Progression in Db

Ebm7 Ab7

Scales to play