F♯9
F# Dominant 9th — a dominant seventh widened with the ninth — fuller, funkier movement toward the resolution.
The keys
F♯ – A♯ – C♯ – E – G♯
What's inside F♯9
| Note | Interval from root | Degree |
|---|---|---|
| F♯ | Root | 1 |
| A♯ | Major 3rd | 3 |
| C♯ | Perfect 5th | 5 |
| E | Minor 7th | b7 |
| G♯ | Major 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 – A♭5 |
Where F♯9 lives
As the I chord
F♯9 → B → D♭ → F♯9
The classic I–IV–V–I motion with this chord as home.
In a ii–V–I
A♭m7 → D♭7 → F♯9
The strongest cadence in harmony, resolving onto this chord.
Put F♯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 →