G Half-diminished
Gm7♭5
Notes
G · B♭ · D♭ · F
Intervals
- RootG (1P)
- Minor 3rdB♭ (3m)
- Diminished 5thD♭ (5d)
- Minor 7thF (7m)
Fretboard
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Voicings & shapes
Drop-2 voicings (12)
Drop-3 voicings (8)
About
The G half-diminished (G–B♭–D♭–F), also written Gø7, is the naturally occurring chord on the seventh degree of a major scale and on the second degree of a natural minor scale. Its primary role in jazz is as the ii chord in a minor ii–V–i: Gm7♭5 → C7 → Fm. The D♭ is the defining color tone — without it, the chord collapses to a plain Gm7. The 3rd and ♭7 together establish the minor seventh quality. On guitar, the fifth is essential and should not be omitted, since the ♭5 is precisely what distinguishes this chord. Compared to Gdim7, m7♭5 is more grounded due to the natural (rather than doubly-flatted) seventh, giving it a somber but less frantic character.
Chord diagrams
G Half-diminished voicing charts — tap a sheet to open it full size to save or print.
Similar chords
Chords sharing two or more notes with this one, ranked by overlap.
Scales containing this chord
- G Blues (deg 1)
- G Locrian (I)
- A♭ Diminished (deg 8)
- A♭ Major (VII)
- A♭ Melodic Minor (VII)
- B Diminished (deg 6)
- B♭ Dorian (VI)
- B♭ Melodic Minor (VI)
- C Phrygian (V)
- D Diminished (deg 4)
- D Harmonic Minor (IV)
- D♭ Lydian (IV)
- E♭ Mixolydian (III)
- F Diminished (deg 2)
- F Harmonic Minor (II)
- F Natural Minor (II)
Scales whose notes include every chord tone. The Roman numeral (or scale degree) marks the chord root’s position in the scale.