Bb-9(#11maj7) Minor-Major 7th
The Bb-9(#11maj7) chord is built from the notes Bb – Db – F – A – C – E.
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Also known as
Bbm(maj9#11)Bbmi(maj9#11)Bbmmaj9#11
Chord tones, one by one
BbRoot
Root
The fundamental note the chord is built on — Bb.
DbThird
Minor third
Three semitones — makes the chord minor (darker, sadder).
FFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
ASeventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
CExtension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
EExtension
Sharp eleventh (♯11)
A ♯11 — the bright, floating Lydian color.
🎼 Related scales
Lydian ♭3harmonic major scale
🎹 Modal analysis
This chord implies the Lydian ♭3 scale; its characteristic note is the ♭3 over a Lydian color. It is a mode of the harmonic major scale.
🎸 Genres
Modern jazz · Post-bop · Fusion