Bb+(maj9) Augmented
The Bb+(maj9) chord is built from the notes Bb – D – F# – A – C.
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Also known as
Bb+maj9Bbma9#5Bbma9(#5)Bbmaj9#5Bbmaj9(#5)
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).
F#Fifth
Augmented fifth (♯5)
Eight semitones — a sharp fifth. Restless and dreamy, typical of augmented chords.
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.
🎼 Related scales
Lydian augmentedmelodic minor a minor 3rd below
🎹 Modal analysis
This chord implies the Lydian augmented scale; its characteristic note is the dreamy, suspended ♯5. It is a mode of the melodic minor a minor 3rd below.
🎸 Genres
Film & TV scoring · Modal jazz · Impressionism