G♭maj13 — G♭, B♭, D♭, F, A♭, E♭ — is a major 13th chord: stacked thirds through the 13th — maj7 + 9 + 13 (the 11th is conventionally omitted to avoid clashing with the 3rd). The full-stacked tonic sonority of advanced jazz harmony.
Intervals
The Gb major 13 chord stacks two thirds on the root. Each interval and its size in semitones:
- Gb→Bbmajor 3rd4 semitones
- Bb→Dbminor 3rd3 semitones
- Db→Fmajor 3rd4 semitones
- F→Abminor 3rd3 semitones
- Ab→Ebperfect 5th7 semitones
On the keyboard
Each note of the Gb major 13 chord highlighted on a piano. Pitch class is what matters — any octave works.
On the guitar
One voicing of the Gb major 13 chord on a six-string guitar fretboard.
- 1Gb
- 3Bb
- 5Db
- 7F
- 9Ab
- 13Eb
Common mistakes
The defining note is the 13th (E♭). It sits more than an octave above the root, which is why the chord needs a wide voicing — in tight piano voicings the 13th usually appears in the top register while the root and lower triad tones cluster below.
In context
Functions as the fully-extended Imaj13 — a complete tonic sonority in modern jazz harmony.
Drill it
The Gb major 13 chord is one of 48 in the Chord Trainer. Open the full trainer to practice it alongside related chords with timing and best-time tracking.
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Frequently asked
- What notes are in a G♭maj13 chord?
- G♭maj13 contains six notes: G♭, B♭, D♭, F, A♭, E♭.
- How is G♭maj13 different from G♭maj7?
- G♭maj13 adds the 13th (E♭) on top of the underlying 7th chord. The 13th extends the chord into the next octave and adds harmonic colour.
- When is G♭maj13 used in music?
- Functions as the fully-extended Imaj13 — a complete tonic sonority in modern jazz harmony.