Bbaug7 Augmented
The Bbaug7 chord is built from the notes Bb – D – F# – A.
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Also known as
Bb+(maj7)Bb+maj7Bbaugmaj7Bbma7#5Bbma7(#5)Bbmaj+7Bbmaj7#5Bbmaj7(#5)Bbmaj7(no5)#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).
🎼 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