Gb7b5

Q: What notes are in the Gb7b5 chord?

The Gb7b5 chord (Gb 7b5) contains: Gb, Bb, C, Fb. Its interval structure is shown above in the Theory section.

Q: How do I build Gb7b5 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 Gb7b5 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 Gb7b5?

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 7b5

Octaves

Musical context

ChordGb majorTriad

ChordGb7b5Gb 7b5

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 7b5
Symbol: Gb7b5
Root: Gb
Quality: 7b5

Chord notes

1Gbroot

3Bbmajor 3rd

b5Cdim 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
4B
b5C
resolves inward to the resolution tonic
6Eb
b7E
resolves down to the tonic 3rd
Main resolution: Gb7b5source
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: Gb7b5source
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.
Gb7b5source
Modal resolution
EE Major
In rock and blues, the dominant often moves to bVII or IV instead of the tonic, creating a modal flavor.
Gb7b5source
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.
Gb7b5source
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, with a diminished 5th
Characteristic interval: Diminished 5th (b5), Minor 7th (b7)
Description: The diminished fifth replaces the perfect fifth, adding a tritone to the dominant tension. Sharper than a regular dom7.
Application: Tritone substitution
Jazz ii-V-I
Altered blues

Voicing & structure

Root position

v1Gb(Gb4)Bass

root

v2Bb(Bb4)M3from Gb

v3C(C5)M2from Bb

v4Fb(Fb5)M3from C

Harmony

Compatible scales

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

ScaleC Whole tone scale ScaleE Whole tone scale ScaleF# Whole tone scale ScaleA# Whole tone scale ScaleD Whole tone scale ScaleG# Whole tone scale ScaleC Enigmatic scale ScaleC Altered (super Locrian)ScaleE Hungarian minor ScaleE Lydian augmented

This chord on guitar 🎸

See how Gb7b5 looks on guitar.

Explore

Circle of fifths

Highlighted major keys contain this chord among their diatonic harmonies.

Relative key: D#mD# minor
Dominant: DbDb major
Subdominant: BB major
Key signature: 6 sharps (F#, C#, G#, D#, A#, E#)

What to learn next

ScaleF# 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

F# Chromatic scaleA scale related to this chord

F# Enigmatic scaleA scale related to this chord

F# Altered (super Locrian)A scale related to this chord

Practice

Keyboard Trainer

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

Open Trainer

Test yourself

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What notes are in the Gb7b5 chord?

How do I build Gb7b5 on the keyboard?

Which keys is Gb7b5 found in?

What can I substitute for Gb7b5?