Ab7b9

Q: What notes are in the Ab7b9 chord?

The Ab7b9 chord (Ab 7b9) contains: Ab, C, Eb, Gb, A. Its interval structure is shown above in the Theory section.

Q: How do I build Ab7b9 on the keyboard?

Take the root and add the remaining chord tones following the interval formula. The highlight shows chord content, while the inversion control changes which chord tone is in the bass.

Q: Which keys is Ab7b9 found in?

The chord acts as a diatonic degree in several keys — they are marked on the circle of fifths in the "Harmonic context" block.

Q: What can I substitute for Ab7b9?

A substitution depends on harmonic function and voice leading, not only on shared tones. Computed options appear in the "Substitutions" block and should be checked in context.

Ab 7b9

Octaves

Musical context

ChordAb majorTriad

ChordAb7b9Ab 7b9

ArpeggioAb majorBroken triad

ScaleAb major7 notes

KeyAb majorMajor key

ProgressionPop axisSequence

How the chord relates to the scale, mode, key and progression.

Theory

General info

Full name: Ab 7b9
Symbol: Ab7b9
Root: Ab
Quality: 7b9

Chord notes

1Abroot

3Cmajor 3rd

5Ebperfect 5th

b7Gbminor 7th

b2Aminor 2nd

Functions & resolutions

Stability / tension: High tension — requires resolution
Most common resolutions: DbDb Major BbmBb Minor
Unstable degrees: 3C
4Db
resolves up to the resolution tonic
6F
b7Gb
resolves down to the tonic 3rd
1Ab
b2A
resolves down to the tonic 5th
Main resolution: Ab7b9source
DbDb Major
Dominant 7th Ab7 naturally resolves up a 4th to Db. It is the tritone between the chord's 3rd and 7th that creates this pull.
Other resolutions: Ab7b9source
Deceptive resolution
BbmBb Minor
Instead of the tonic, the dominant resolves to the vi degree. Creates surprise and is often used to extend a musical phrase.
Ab7b9source
Modal resolution
GbGb Major
In rock and blues, the dominant often moves to bVII or IV instead of the tonic, creating a modal flavor.
Ab7b9source
Jazz reharmonization
D7D Dominant 7
Tritone substitution: Ab7 can be replaced by D7 (a tritone away). Both chords share the same tritone between the 3rd and 7th, resolving to the same tonic.
Ab7b9source
Functional resolution
Absus4Ab 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: D7D Dominant 7

Features

Character: Dominant, with minor-9th dissonance
Characteristic interval: Minor 7th (b7), Minor 9th (b9)
Description: The minor 9th forms a compound-semitone dissonance with the root, while the minor 7th preserves dominant function. On V in minor, b9 normally corresponds to scale degree 6 and resolves downward.
Application: V7b9 → i in minor
Flamenco and Latin jazz
Minor jazz cadences

Voicing & structure

Root position

v1Ab(Ab4)Bass

root

v2C(C5)M3from Ab

v3Eb(Eb5)m3from C

v4Gb(Gb5)m3from Eb

v5A(A5)m3from Gb

Harmony

Compatible scales

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

ScaleF# Romanian minor ScaleF# Ukrainian Dorian ScaleG# Phrygian dominant ScaleC# Harmonic minor ScaleC# Harmonic major ScaleE Harmonic major ScaleC Diminished scale ScaleD# Diminished scale ScaleF# Diminished scale ScaleG# Diminished (half–whole)

This chord on guitar 🎸

See how Ab7b9 looks on guitar.

Explore

Circle of fifths

Highlighted major keys contain this chord among their diatonic harmonies.

Relative key: FmF minor
Dominant: EbEb major
Subdominant: DbDb major
Key signature: 4 flats (Bb, Eb, Ab, Db)

What to learn next

ScaleAb Chromatic scaleScale to improvise over this chord PracticeChord trainerLock the fingering into muscle memory ProgressionChord progressionsHow this chord works inside real progressions

Recommended for you

Ab Chromatic scaleA scale related to this chord

Practice

Keyboard Trainer

Reinforce it in practice — play and name notes on the interactive keyboard.

Open Trainer

Test yourself

(Press any key to start)

What notes are in the Ab7b9 chord?

How do I build Ab7b9 on the keyboard?

Which keys is Ab7b9 found in?

What can I substitute for Ab7b9?