Gb7

Q: What notes are in the Gb7 chord?

The Gb7 chord (Gb Dominant 7) contains: Gb, Bb, Db, Fb. Its interval structure is shown above in the Theory section.

Q: How do I build Gb7 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 Gb7 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 Gb7?

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.

Gb Dominant 7

Octaves

Musical context

ChordGb majorTriad

ChordGb7Gb Dominant 7

ArpeggioGb majorBroken triad

ScaleGb major7 notes

KeyGb majorMajor key

ProgressionPop axisSequence

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

Theory

General info

Full name: Gb Dominant 7
Symbol: Gb7
Root: Gb
Quality: Dominant 7

Chord notes

1Gbroot

3Bbmajor 3rd

5Dbperfect 5th

b7Fbminor 7th

Functions & resolutions

Typical function in key: IVSubdominant (IV)C# major
Stability / tension: High tension — requires resolution
Most common resolutions: BB Major AbmAb Minor
Unstable degrees: 3Bb
4B
resolves up to the resolution tonic
6Eb
b7E
resolves down to the tonic 3rd
Main resolution: Gb7source
BB Major
Dominant 7th Gb7 naturally resolves up a 4th to B. It is the tritone between the chord's 3rd and 7th that creates this pull.
Other resolutions: Gb7source
Deceptive resolution
G#mG# Minor
Instead of the tonic, the dominant resolves to the vi degree. Creates surprise and is often used to extend a musical phrase.
Gb7source
Modal resolution
EE Major
In rock and blues, the dominant often moves to bVII or IV instead of the tonic, creating a modal flavor.
Gb7source
Jazz reharmonization
C7C Dominant 7
Tritone substitution: Gb7 can be replaced by C7 (a tritone away). Both chords share the same tritone between the 3rd and 7th, resolving to the same tonic.
Gb7source
Functional resolution
Gbsus4Gb 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: C7C 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