Ab7

Q: What notes are in the Ab7 chord?

The Ab7 chord (Ab Dominant 7) contains: Ab, C, Eb, Gb. Its interval structure is shown above in the Theory section.

Q: How do I build Ab7 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 Ab7 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 Ab7?

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 Dominant 7

Octaves

Musical context

ChordAb majorTriad

ChordAb7Ab Dominant 7

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 Dominant 7
Symbol: Ab7
Root: Ab
Quality: Dominant 7

Chord notes

1Abroot

3Cmajor 3rd

5Ebperfect 5th

b7Gbminor 7th

Functions & resolutions

Typical function in key: VDominant (V)C# major
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
Main resolution: Ab7source
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: Ab7source
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.
Ab7source
Modal resolution
GbGb Major
In rock and blues, the dominant often moves to bVII or IV instead of the tonic, creating a modal flavor.
Ab7source
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.
Ab7source
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, tense
Characteristic interval: Dominant 7th (b7)
Description: The minor 7th adds dissonance to a major triad. On scale degree V, the chord’s 3rd and 7th form a tritone that directs the voices toward tonic.
Application: V chord in major (resolves to I)
12-bar blues
Rock, Mixolydian