Chord sequence

A7, D7, A7, D7, A7, Bm7, Bb7, A7, Bb7

A7 D7 A7 D7 A7 Bm7 B♭7 A7 B♭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

A7
D7
A7
D7
A7
Bm7
Bb7
A7
Bb7

Analysis

Heard in A major

Each chord's roman numeral and role in A major
Chord	Numeral	Role
A7	V7/IV	Secondary dominant of IV
D7	IV7	Blues dominant
A7	V7/IV	Secondary dominant of IV
D7	IV7	Blues dominant
A7	I7	Blues dominant
Bm7	ii7	Subdominant
B♭7	subV7	Tritone substitute for V7
A7	I7	Blues dominant
B♭7	subV7	Tritone substitute for V7

Scales to play