G9

General info

Full name

G 9th

Symbol

G9

Root

G

Quality

9th

Chord notes

Functions & resolutions

Typical function in key

VDominant (V)C major

Stability / tension

High tension — requires resolution

Most common resolutions

CC MajorAmA Minor

Unstable degrees

3B

4C

resolves up to the resolution tonic

6E

b7F

resolves down to the tonic 3rd

Main resolution

G9source

CC Major

Dominant 7th G7 naturally resolves up a 4th to C. It is the tritone between the chord's 3rd and 7th that creates this pull.

Other resolutions

G9source

Deceptive resolution

AmA Minor

Instead of the tonic, the dominant resolves to the vi degree. Creates surprise and is often used to extend a musical phrase.

G9source

Modal resolution

FF Major

In rock and blues, the dominant often moves to bVII or IV instead of the tonic, creating a modal flavor.

G9source

Jazz reharmonization

C#7C# Dominant 7

Tritone substitution: G7 can be replaced by C#7 (a tritone away). Both chords share the same tritone between the 3rd and 7th, resolving to the same tonic.

G9source

Functional resolution

Gsus4G Sus4

The dominant can resolve beyond the tonic: moving to IV (subdominant) or to a suspension (sus4) are common alternatives in pop and folk music.

Substitutions

Tritone substitution

C#7C# Dominant 7

Features

Character

Dominant, with a minor 7th and major 9th

Characteristic interval

9th

Description

The major 3rd and minor 7th form a dominant core, while the major 9th adds a diatonic extension. The dominant tritone preserves directed tension toward resolution.

Application

• V9–I in jazz
• Funk and soul
• Blues harmony

Voicing & structure

Harmony

Typical progressions

I-V-vi-IV

C—G—Am—F

Pop

Compatible scales

All chord tones are contained in these scales — use them for improvisation.