Chord · Altered Dom.
B♭7♯5♭9/11 — B♭ Altered ♯5♭9 / 11th
B♭7♯5♭9/11 is the B♭ altered ♯5♭9 / 11th chord. It is built on the root B♭ with major 3rd (D), augmented 5th (F♯), minor 7th (A♭), minor 9th (C♭) and perfect 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♭7♯5♭9/11.
- Root
- B♭
- Quality
- Altered ♯5♭9 / 11th
- Formula
- 1 3 ♯5 ♭7 ♭9 11
- Notes
- B♭ D F♯ A♭ C♭ E♭
On the keyboard
The notes of B♭7♯5♭9/11
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | B♭ | root | B♭3 |
| 3 | D | major 3rd | D4 |
| ♯5 | F♯ | augmented 5th | F♯4 |
| ♭7 | A♭ | minor 7th | A♭4 |
| ♭9 | C♭ | minor 9th | C♭5 |
| 11 | E♭ | perfect 11th | E♭5 |
Other altered dom. on B♭
Altered ♯5♭9 / 11th chords on every root
Part of the chord reference. See also the scales and the keys.