The F♯ Add 9 chord is a four-note chord made up of F♯, A♯, C♯, and G♯. It is built from a root, major third, perfect fifth, and major ninth.
Construction
F♯ Add 9 = Root + Major 3rd + Perfect 5th + Major 2nd = F♯ · A♯ · C♯ · G♯
| Note | Interval | Degree |
|---|---|---|
| F♯ | Root | 1 |
| A♯ | Major 3rd | 3 |
| C♯ | Perfect 5th | 5 |
| G♯ | Major 2nd | 2 |
F♯ Add 9 Inversions
| Position | Notes |
|---|---|
| Root Position | F♯ – A♯ – C♯ – G♯ |
| 1st Inversion | A♯ – C♯ – F♯ – G♯ |
| 2nd Inversion | C♯ – F♯ – G♯ – A♯ |
| 3rd Inversion | F♯ – G♯ – A♯ – C♯ |
Key Signature
A chord has no key signature of its own, but the F♯ Add 9 is the tonic (I) chord of F# Major, whose key signature has 6 sharps (F♯, C♯, G♯, D♯, A♯, E♯).
F♯C♯G♯D♯A♯E♯
Order of sharps
Sharps are added to a key signature in a fixed order. Each new sharp key adds the next sharp on the list.
F♯C♯G♯D♯A♯E♯B♯
Mnemonic: Father Charles Goes Down And Ends Battle
Chords in the Key of F♯ Major
These are the triads built on each degree of the F♯ major scale:
Same Notes, Other Names
The notes F♯ – A♯ – C♯ – G♯ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
F♯ Add 9 — Frequently Asked Questions
What is the F♯ Add 9 chord on piano?
The F♯ Add 9 chord contains the notes F♯ – A♯ – C♯ – G♯. On piano, play these notes together to sound the chord.
What notes are in the F# Add 9 chord?
F# Add 9 is built from the F# root. Check the interactive keyboard above for exact notes and fingering.
How is the F# Add 9 chord used in music?
F# Add 9 appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Add 9).
What is the fingering for F# Add 9?
See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.
What are the inversions of F# Add 9?
Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.