F♯add9
F# Added 9th — a plain triad plus the ninth — colour without the seventh, clean and contemporary.
The keys
F♯ – A♯ – C♯ – G♯
What's inside F♯add9
| Note | Interval from root | Degree |
|---|---|---|
| F♯ | Root | 1 |
| A♯ | Major 3rd | 3 |
| C♯ | Perfect 5th | 5 |
| G♯ | Major 9th | 9 |
Inversions
| Position | Keys (low → high) |
|---|---|
| Root position | G♭4 – B♭4 – D♭5 – A♭5 |
| 1st inversion | B♭4 – D♭5 – A♭5 – G♭5 |
| 2nd inversion | D♭5 – A♭5 – G♭5 – B♭5 |
| 3rd inversion | A♭5 – G♭5 – B♭5 – D♭6 |
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 – D♭3 |
| Right (colour) | B♭4 – A♭5 |
Where F♯add9 lives
As the I chord
F♯add9 → B → D♭ → F♯add9
The classic I–IV–V–I motion with this chord as home.
In a ii–V–I
A♭m7 → D♭7 → F♯add9
The strongest cadence in harmony, resolving onto this chord.
Put F♯add9 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 →