Gbma13(#11) Major 7th
The Gbma13(#11) chord is built from the notes Gb – Bb – Db – F – Ab – C – Eb.
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Also known as
Gbmaj13(#4)
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.
CExtension
Sharp eleventh (♯11)
A ♯11 — the bright, floating Lydian color.
EbExtension
Thirteenth (13)
A 13th — full, rich top extension.
🎼 Related scales
🎹 Modal analysis
This chord implies the Lydian scale; its characteristic note is the bright, floating ♯11.
🎸 Genres
Film & TV scoring · Modal jazz · Impressionism