Gbm7b5 Guitar Chord Diagrams | Gb Minor Seventh Flat five
The Gb half-diminished chord (Gbm7b5) combines Gb, Bbb, Dbb and Fb, that is the root, minor third, flat five and minor seventh.
Its enharmonic twin is F#m7b5, which sounds exactly the same. Compared with a minor seventh chord only the fifth changes: it is lowered by a semitone. The pitches of Gbm7b5 form the vii chord of G major and the ii chord of E minor, where the same chord carries another spelling. The Gb Locrian scale contains all four chord tones, which makes it a reliable scale for soloing over Gbm7b5. Spelling it correctly takes Bbb, Dbb and Fb, which is why the same sound is also written F#m7b5.
The only tritone in the chord lies between the root and the flat five.
Gb minor 7th with flat 5th guitar chord is also written as Gbm7b5, Gbm7(b5), Gbø7 or Gbmin7b5. It is also known as the Gb half-diminished chord.
Gb m7b5 chord Notes:
Tones of the Minor Seventh Flat five chord:
Formula: 1 b3 b5 b7
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Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
What notes does Gbm7b5 contain?
Gbm7b5 is spelled Gb, Bbb, Dbb and Fb. These are the root, minor third, flat fifth and minor seventh, and they sound like F#, A, C and E.
Why does Gbm7b5 have two double flats?
Letters run G, B, D, F. A minor third from Gb is Bbb, and a flat fifth is Dbb. Both sound like A and C, but the letters keep the chord readable.
Is Gbm7b5 the same chord as F#m7b5?
Yes. Gbm7b5 and F#m7b5 sound the same because their pitches match. F#m7b5 is the simpler spelling and avoids the double flats.
Which scale fits Gbm7b5?
The Gb Locrian scale, Gb, Abb, Bbb, Cb, Dbb, Ebb, Fb, includes all four chord tones. It is a theoretical spelling of F# Locrian.
In which keys does Gbm7b5 appear?
Gbm7b5 has the same pitches as the vii chord of G major and the ii chord of E minor, where it is written F#m7b5.
