Gbm13 Guitar Chord Chart and Fingering
The Gbm13 chord (Gb minor thirteenth) is spelled Gb, Bbb, Db, Fb, Ab, Cb and Eb. It sounds identical to F#m13, which writes the same pitches without a double flat. Both names describe the same pitches, so only the spelling differs with the key, and Bbb is simply the note A.
The Bbb is the minor third, the Fb the minor seventh and the Cb the eleventh. In the flat spelling the Eb is the thirteenth, and the Ab is the ninth, a whole step above the root. The Gb Dorian scale holds all seven notes.
Gb minor 13th guitar chord is also written as Gbm13, Gbmin13 or Gb-13.
Gbm13 Chord Notes and Formula
Notes of the Gb m13 chord:
Chord Formula:
Formula: 1 b3 5 b7 9 11 13
Same chord, different name: Gbm13 is also written as F#m13 (F# minor thirteenth).
Gb M13 Chord Interactive Fretboard
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Chords That Go With Gbm13
One key where Gbm13 fits is A major, where it works as the vi chord. These are the main chords of that key, the ones you will often hear around it:
See every key in the guitar keys chart, or build a progression with these chords in the chord progression generator.
More Gb Chords
Want to know how this chord is built? Read chord symbols and intervals, or browse all Gb guitar chords.
Created by
Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
Which notes are in Gbm13?
Gbm13 is Gb, Bbb, Db, Fb, Ab, Cb and Eb. Bbb sounds like A, Fb like E and Cb like B.
Why does Gbm13 have a Bbb?
The third of a G chord takes the letter B, and a minor third up from Gb is B lowered twice, written Bbb. It sounds like A, but A would break the letter order G, B, D, F, A, C, E.
Is F#m13 another name for Gbm13?
Yes, F#m13 is the same chord written F#, A, C#, E, G#, B and D#. It avoids the double flat and is easier to read.
What is the thirteenth in Gb minor thirteenth?
Eb, a major sixth up from Gb, counted an octave higher. It is the sixth degree of Gb Dorian.
Which scale holds all of Gbm13?
Gb Dorian: Gb, Ab, Bbb, Cb, Db, Eb, Fb. The chord uses all seven of its notes, so nothing falls outside the scale.
