Bbmaj7(b5)(#4) Major 7th
The Bbmaj7(b5)(#4) chord is built from the notes Bb – D – Fb – A – E.
Piano sound loads on first tap.
Also known as
Bbmaj7b5#11
Chord tones, one by one
BbRoot
Root
The fundamental note the chord is built on — Bb.
DThird
Major third
Four semitones — makes the chord major (brighter, happier).
FbFifth
Diminished fifth (♭5)
Six semitones — a flat fifth. Creates instability, typical of m7♭5 and diminished chords.
ASeventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
EExtension
Sharp eleventh (♯11)
A ♯11 — the bright, floating Lydian color.
🎼 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