Gbm9b5

General info

Full name

Gb Minor 9b5

Symbol

Gbm9b5

Root

Gb

Quality

Minor 9b5

Chord notes

Functions & resolutions

Stability / tension

Stable — can serve as major tonic

Most common resolutions

BB MajorDbDb MajorEbmEb Minor

Unstable degrees

4B

b5C

resolves inward to the 4th

4B

b7E

resolves down to the resolution tonic

Main resolution

Gbm9b5source

DbDb Major

Major chord Gb is a stable tonic. As tonic it doesn't require resolution, but in a progression context typically moves to IV or V.

Other resolutions

Gbm9b5source

Deceptive resolution

EbmEb Minor

As the V degree, a major chord can defy expectations by moving to vi instead of I (deceptive cadence).

Gbm9b5source

Modal resolution

EE Major

In modal context, a major chord can freely move to bVII, bIII, or bVI — characteristic of Mixolydian mode.

Gbm9b5source

Jazz reharmonization

Gbmaj7Gb Major 7

In jazz, a major chord is enriched to maj7, 6/9, or add9 and can smoothly transition into a ii-V of another key (modulation).

Gbm9b5source

Functional resolution

DbDb Major

As the IV degree (subdominant), a major chord can resolve to V or directly to I (plagal cadence).

Features

Character

Half-diminished, with an added 9th

Characteristic interval

Diminished 5th (b5), 9th

Description

The minor 3rd, diminished 5th, and minor 7th form a half-diminished seventh chord; the major 9th adds a diatonic extension. The b5 dissonance preserves the instability of the core.

Application

• ii-V in minor (extended)
• Modern jazz
• Substitute for m7b5 with ninth

Voicing & structure

Harmony

Compatible scales

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