Chord · 11ths
B♭9♯11 — B♭ Dominant 9th ♯11
B♭9♯11 is the B♭ dominant 9th ♯11 chord. It is built on the root B♭ with major 3rd (D), perfect 5th (F), minor 7th (A♭), major 9th (C) and augmented 11th (E) above it — the formula 1 3 5 ♭7 9 ♯11, sounding the notes B♭ D F A♭ C E. On the piano it sits at Bb (octave 3) and above in the library's voicing; the same 6 notes in any octave are still B♭9♯11.
- Root
- B♭
- Quality
- Dominant 9th ♯11
- Formula
- 1 3 5 ♭7 9 ♯11
- Notes
- B♭ D F A♭ C E
On the keyboard
The notes of B♭9♯11
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | B♭ | root | B♭3 |
| 3 | D | major 3rd | D4 |
| 5 | F | perfect 5th | F4 |
| ♭7 | A♭ | minor 7th | A♭4 |
| 9 | C | major 9th | C5 |
| ♯11 | E | augmented 11th | E5 |
Other 11ths on B♭
Dominant 9th ♯11 chords on every root
Part of the chord reference. See also the scales and the keys.