Chord sequence

Bbm7, Eb7, Abm7, Db7, Gbm7, B7, Dbmaj7

B♭m7 E♭7 A♭m7 D♭7 G♭m7 B7 D♭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

Bbm7
Eb7
Abm7
Db7
Gbm7
B7
Dbmaj7

Analysis

Heard in Db major

Each chord's roman numeral and role in Db major
Chord	Numeral	Role
B♭m7	vi7	Diatonic
E♭7	V7/v	Secondary dominant of v
A♭m7	ii7/iv	ii of the ii-V to iv
D♭7	V7/iv	Secondary dominant of iv
G♭m7	iv7	Borrowed from Db minor
B7	♭VII7	Borrowed from Db minor
D♭maj7	Imaj7	Tonic

Progressions in these changes

All the chords

Whole-Step ii-V Chain in Db

Three ii-Vs, each a whole step below the last and the last one the backdoor ii-V: a chain of keys that doesn't arrive until the end.

Scales to play