Chord sequence

D#m7, D7, C#m7, C7

D♯m7 D7 C♯m7 C7

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

D#m7
D7
C#m7
C7

Analysis

Heard in B major

Each chord's roman numeral and role in B major
Chord	Numeral	Role
D♯m7	iii7	Diatonic
D7	subV7/ii	Tritone substitute for V7/ii
C♯m7	ii7	Subdominant
C7	?	Outside the key (bII7)

Progressions in these changes

All the chords

Chromatic iii-bIII-ii-bII Progression in B

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