Bb7#5 chord
Bb augmented 7th · also written A#7#5
C4
Bb
C5
D
F#
Ab
Want it in context? Open Bb7#5 on the full piano.
Notes
- BbR
- D3
- F##5
- Abb7
Formula: R – 3 – #5 – b7
Bb7#5 inversions
The same notes, with a different note in the bass.
Root position Bb7#5
C4
Bb
C5
D
F#
Ab
1st inversion Bb7#5/D
C5
D
F#
Ab
Bb
C6
2nd inversion Bb7#5/F#
C5
F#
Ab
Bb
C6
D
3rd inversion Bb7#5/Ab
C5
Ab
Bb
C6
D
F#
More Bb chords
Augmented 7th chords in other keys
FAQ
What notes are in the Bb7#5 chord?
The Bb augmented 7th chord (Bb7#5) has 4 notes: Bb, D, F# and Ab.
How do you play Bb7#5 on the piano?
Put your right hand on Bb, D, F# and Ab, 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 augmented 7th chord?
R – 3 – #5 – b7 (in semitones from the root: 0, 4, 8, 10).
Is Bb7#5 the same as A#7#5?
Yes. Bb and A# are the same key on the piano (enharmonic), so Bb7#5 and A#7#5 sound the same.