Gbmaj13b13 Major 7th
The Gbmaj13b13 chord is built from the notes Gb – Bb – Db – F – Ab – Ebb.
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Also known as
Gbmaj9(b15)
Chord tones, one by one
GbRoot
Root
The fundamental note the chord is built on — Gb.
BbThird
Major third
Four semitones — makes the chord major (brighter, happier).
DbFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
FSeventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
AbExtension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
EbbExtension
Flat thirteenth (♭13)
A ♭13 — dark altered tension over a dominant chord.
🎼 Related scales
🎹 Modal analysis
This chord implies the Harmonic major scale; its characteristic note is the dark ♭6.
🎸 Genres
Jazz · Gospel · Classical