Bb
Bbaug7
Notes
Bb · D · F# · Ab
Intervals
- RootBb (1P)
- Major 3rdD (3M)
- Augmented 5thF# (5A)
- Minor 7thAb (7m)
Fretboard
On the fretboard, Gb represents F#.
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About
The B♭aug7 (B♭–D–F♯–A♭) raises the fifth, replacing the perfect fifth with an augmented fifth. The F♯ adds a floating, upward-pulling quality to the dominant sound — unlike the inward pull of the ♭5, the ♯5 creates outward tension that resolves naturally when the chord moves to a tonic; here the natural target is E♭. The 3rd, ♭7, and ♯5 are all essential; the ♯5 is what distinguishes this from a plain B♭7. Common in jazz and blues as a voice-leading tool — the ♯5 often resolves up to the third of the tonic chord. Compared to B♭7♭5, aug7 feels more expansive and less claustrophobic.
Similar chords
Chords sharing two or more notes with this one, ranked by overlap.
Scales containing this chord
- B♭ Whole Tone (deg 1)
- A♭ Whole Tone (deg 2)
- B Melodic Minor (VII)
- C Whole Tone (deg 6)
- D Whole Tone (deg 5)
- E Whole Tone (deg 4)
- E♭ Diminished (deg 5)
- E♭ Harmonic Minor (V)
- E♭ Melodic Minor (V)
- F♯ Whole Tone (deg 3)
Scales whose notes include every chord tone. Roman numeral marks the chord root’s position in the scale; dashed badges aren’t linked yet.