F♯7♯9
F# Dominant 7th Sharp 9 — major and minor thirds colliding in one chord — gritty, electric, built for emphatic moments.
The keys
F♯ – A♯ – C♯ – E – A
What's inside F♯7♯9
| Note | Interval from root | Degree |
|---|---|---|
| F♯ | Root | 1 |
| A♯ | Major 3rd | 3 |
| C♯ | Perfect 5th | 5 |
| E | Minor 7th | b7 |
| A (spelled G♯♯) | 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) | G♭2 – E3 |
| Right (colour) | B♭4 – A5 |
Where F♯7♯9 lives
Hard resolution
F♯7♯9 → Bm9
Altered dominants resolve with maximum drama — especially into minor.
Chromatic approach
D♭m7 → F♯7♯9 → B
The alteration sharpens the pull of the standard two-five.
Put F♯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 →