Chord sequence

Dbmaj7, E7, Ebm7, D7

D♭maj7 E7 E♭m7 D7

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

Dbmaj7
E7
Ebm7
D7

Analysis

Heard in Db major

Each chord's roman numeral and role in Db major
Chord	Numeral	Role
D♭maj7	Imaj7	Tonic
E7	subV7/ii	Tritone substitute for V7/ii
E♭m7	ii7	Subdominant
D7	subV7	Tritone substitute for V7

Progressions in these changes

All the chords

Tritone Sub Turnaround in Db

The I-VI-ii-V with tritone substitutes for its dominants, bIII7 for VI7 and bII7 for V7, so the bass falls by half steps from bIII back to I.

Scales to play