B♭7♯9
Bb Dominant 7th Sharp 9 — major and minor thirds colliding in one chord — gritty, electric, built for emphatic moments.
The keys
B♭ – D – F – A♭ – C♯
What's inside B♭7♯9
| Note | Interval from root | Degree |
|---|---|---|
| B♭ | Root | 1 |
| D | Major 3rd | 3 |
| F | Perfect 5th | 5 |
| A♭ | Minor 7th | b7 |
| C♯ | Sharp 9th | #9 |
A working voicing
Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:
| Hand | Keys |
|---|---|
| Left (shell) | B♭2 – A♭3 |
| Right (colour) | D5 – D♭6 |
Where B♭7♯9 lives
Hard resolution
B♭7♯9 → E♭m9
Altered dominants resolve with maximum drama — especially into minor.
Chromatic approach
Fm7 → B♭7♯9 → E♭
The alteration sharpens the pull of the standard two-five.
Put B♭7♯9 under your fingers
Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.
Open the Chord & Voicing Lab →