Ab13b9

General info

Full name

Ab 13b9

Symbol

Ab13b9

Root

Ab

Quality

13b9

Chord notes

Functions & resolutions

Stability / tension

Stable — can serve as major tonic

Most common resolutions

DbDb MajorEbEb MajorFmF Minor

Unstable degrees

4Db

b7Gb

resolves down to the resolution tonic

Main resolution

Ab13b9source

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

Ab13b9source

Deceptive resolution

FmF Minor

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

Ab13b9source

Modal resolution

GbGb Major

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

Ab13b9source

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).

Ab13b9source

Functional resolution

EbEb Major

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

Substitutions

Tritone substitution

D7D Dominant 7

Features

Character

Dominant, with b9 and 13th

Characteristic interval

Minor 9th (b9), 13th

Description

The minor 9th sharpens dominant tension, while the major 13th adds a consonant extension. The contrast between b9 and 13 makes the chord dense while preserving a clear dominant function.

Application

• V13b9 → i in minor
• Latin jazz
• Advanced jazz cadences

Voicing & structure

Harmony

Compatible scales

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