Chord sequence

Gb7, Cb7, Gb7, Cb7, Gb7, Db7, Cb7, Gb7, G7

G♭7 C♭7 G♭7 C♭7 G♭7 D♭7 C♭7 G♭7 G7

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

Gb7
Cb7
Gb7
Cb7
Gb7
Db7
Cb7
Gb7
G7

Analysis

Heard in Gb major

Each chord's roman numeral and role in Gb major
Chord	Numeral	Role
G♭7	V7/IV	Secondary dominant of IV
C♭7	IV7	Blues dominant
G♭7	V7/IV	Secondary dominant of IV
C♭7	IV7	Blues dominant
G♭7	I7	Blues dominant
D♭7	V7	Dominant
C♭7	IV7	Blues dominant
G♭7	I7	Blues dominant
G7	subV7	Tritone substitute for V7

Scales to play