Abm9b5

General info

Full name

Ab Minor 9b5

Symbol

Abm9b5

Root

Ab

Quality

Minor 9b5

Chord notes

Functions & resolutions

Stability / tension

Stable — can serve as major tonic

Most common resolutions

DbDb MajorEbEb MajorFmF Minor

Unstable degrees

4Db

b5D

resolves inward to the 4th

4Db

b7Gb

resolves down to the resolution tonic

Main resolution

Abm9b5source

EbEb Major

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

Other resolutions

Abm9b5source

Deceptive resolution

FmF Minor

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

Abm9b5source

Modal resolution

GbGb Major

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

Abm9b5source

Jazz reharmonization

Abmaj7Ab 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).

Abm9b5source

Functional resolution

EbEb 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.