About the B flat augmented chord
B flat augmented is used in D Lydian Augmented, where its notes spell the I+ chord. Think of it as a B♭ augmented chord.
Its notes are B♭, D, and F♯. The intervals are a major third and an augmented fifth.
Also called augmented triad and +. A sharp augmented spells the same notes enharmonically. In shorthand it is commonly written Bbaug.
Positions
Notes and intervals
| 1 | BbB♭ | Root |
|---|---|---|
| 2 | DD | Major 3rd |
| 3 | F#F♯ | Augmented 5th |
Shapes
Chromatic
Circle of Fifths
Keys that use B flat augmented
B flat augmented is diatonic to these keys, where its notes spell the chord shown.
Other B flat chords
Simpler triads
Suspended
Sixths and sevenths
Extensions
Altered
Functional relationships
These chords are where this one most naturally comes from and resolves to inside a key.
Relative minor
The relative minor uses the same notes and key signature, so it works as a calmer, darker home base.
Parallel minor
The parallel minor keeps the same root note but lowers the third, giving the same key a darker, sadder sound.
Dominant
The dominant is a fifth above the root, and it builds tension that pulls strongly back to this chord.
Subdominant
The subdominant is a fourth above the root (a fifth below), and it usually leads on to the dominant or back home.
Tritone substitution
The tritone substitution stands in for this chord's dominant with a dominant seventh a half step above the root, which slides down by a half step to resolve here.
Embed this chord
