B7♯9
B Dominant 7th Sharp 9 — major and minor thirds colliding in one chord — gritty, electric, built for emphatic moments.
The keys
B – D♯ – F♯ – A – D
What's inside B7♯9
| Note | Interval from root | Degree |
|---|---|---|
| B | Root | 1 |
| D♯ | Major 3rd | 3 |
| F♯ | Perfect 5th | 5 |
| A | Minor 7th | b7 |
| D (spelled 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) | B2 – A3 |
| Right (colour) | E♭5 – D6 |
Where B7♯9 lives
Hard resolution
B7♯9 → Em9
Altered dominants resolve with maximum drama — especially into minor.
Chromatic approach
G♭m7 → B7♯9 → E
The alteration sharpens the pull of the standard two-five.
Put B7♯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 →