Bb9 chord
Bb dominant 9th · also written A#9
C4
Bb
C5
D
F
Ab
C
Want it in context? Open Bb9 on the full piano.
Notes
- BbR
- D3
- F5
- Abb7
- C9
Formula: R – 3 – 5 – b7 – 9
Bb9 inversions
The same notes, with a different note in the bass.
Root position Bb9
C4
Bb
C5
D
F
Ab
1st inversion Bb9/D
C5
D
F
Ab
Bb
C6
2nd inversion Bb9/F
C5
F
Ab
Bb
C6
D
3rd inversion Bb9/Ab
C5
Ab
Bb
C6
D
F
More Bb chords
Dominant 9th chords in other keys
FAQ
What notes are in the Bb9 chord?
The Bb dominant 9th chord (Bb9) has 5 notes: Bb, D, F, Ab and C.
How do you play Bb9 on the piano?
Put your right hand on Bb, D, F, Ab and C, starting from Bb. A common fingering for three-note chords is thumb (1), middle finger (3) and little finger (5).
What is the formula of a dominant 9th chord?
R – 3 – 5 – b7 – 9 (in semitones from the root: 0, 4, 7, 10, 14).
Is Bb9 the same as A#9?
Yes. Bb and A# are the same key on the piano (enharmonic), so Bb9 and A#9 sound the same.