F#9 piano chord — the keys, the inversions, the theory
F#9 is a ninth chord built from F#, A#, C#, E, G#. Below: the keys to press, every inversion with its own diagram, the intervals it is made of, the keys whose scale contains it, and a progression that actually uses it. Press any diagram to hear it.
F#9
F# · A# · C# · E · G#
Semitones above the root: 0 – 4 – 7 – 10 – 14
A major third with a flattened seventh above it: unstable on purpose, and it wants to resolve a fourth up.
Inversions of F#9
Root position
F# · A# · C# · E · G# · bass F#
Inversion 1
A# · C# · E · F# · G# · bass A#
Inversion 2
C# · E · F# · G# · A# · bass C#
Inversion 3
E · F# · G# · A# · C# · bass E
Same chord, different note at the bottom. Press a diagram to hear it — inversions are how you move between chords without jumping your hand across the keyboard.
Keys that contain F#9
- BV
In B it does this job: I – V – vi – IV
- B
- F#9
- G#m
- E