About the B flat augmented seven flat nine chord
B flat augmented seven flat nine sits outside the plain diatonic set, so it is borrowed to add color and tension. Think of it as a B♭ augmented seventh flat nine chord.
Its notes are B♭, D, F♯, A♭, and C♭. The intervals are a major third, an augmented fifth, a minor seventh, and a minor ninth.
Also called A sharp augmented seven flat nine, which spells the same notes enharmonically. In shorthand it is commonly written Bbaug7b9.
Inversions
B flat augmented seven flat nine (root position)
Notes and intervals
| 1 | B flat | Root |
|---|---|---|
| 2 | D | Major 3rd |
| 3 | F sharp | Augmented 5th |
| 4 | A flat | Minor 7th |
| 5 | C flat | Minor 9th |
Shapes
Chromatic
Circle of Fifths
Other B flat chords
Simpler triads
Suspended
B flat suspended two chordB flat suspended four chordB flat seven suspended four chordB flat nine suspended four chordB flat thirteen suspended four chord
Sixths and sevenths
B flat six chordB flat minor six chordB flat minor flat six chordB flat seven chordB flat major seven chordB flat minor seven chordB flat minor seven flat five chordB flat diminished seven chordB flat minor major seven chordB flat major seven flat five chordB flat major seven sharp five chordB flat minor major seven flat five chord
Extensions
B flat nine chordB flat add nine chordB flat major nine chordB flat minor nine chordB flat eleven chordB flat thirteen chordB flat six nine chordB flat minor add nine chordB flat major eleven chordB flat major thirteen chordB flat minor eleven chordB flat minor thirteen chordB flat minor six nine chordB flat minor major nine chordB flat minor major eleven chord
Altered
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