Learn › F#add9 Chord on Piano (F Sharp Add 9)
New Released in April 2026
F#add9 Chord on Piano (F Sharp Add 9)
F#add9, the F sharp add 9 chord, is the major triad F# plus the 9th, G#, with no seventh in between. Its notes on the piano are F#, A#, C# and G#. Expect a sound that is clear and sparkling, the plain triad with one extra colour.
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- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
Ways to place F#add9 on the keys
Same notes, different order. Pick the position closest to the chord you just played.
Root position: F# G# A# C#
1st inversion: A# C# F# G#
2nd inversion: C# F# G# A#
Hands and fingers
| Right hand | F# G# A# C# | 1 2 3 5 |
|---|---|---|
| Left hand | F# G# A# C# | 5 4 3 1 |
F#add9 and F#sus2
Take F#sus2 (F# G# C#) and add the third A#: you have F#add9. That is why F#add9 still sounds major, while F#sus2 does not.
Building F#add9 from F#
Start from F#, which you may already know, and change one thing: add G#, the 9th, an octave plus a whole step above F#.
Start chord: F#
| Note | Step | Interval | Keys from F# |
|---|---|---|---|
| F# | 1 | root | 0 |
| A# | 3 | major 3rd | 4 |
| C# | 5 | perfect 5th | 7 |
| G# | 9 | major 9th | 14 |
A short F#add9 routine
- Find F#, then add the other notes one at a time: F#, A#, C# and G#.
- Play F#, then F#add9, then F# again, and hear what the 9th adds on top.
- Try F#add9 in 1st inversion, the position that sits closest to your last chord.
- Last, meet F#add9 mixed with chords you already know, in an order you did not plan.
Keep each session short and frequent and F#add9 will become automatic.
When to play F#add9
- F#add9 fits wherever F# fits: F# major, C# major and B major.
- Pop and worship songs use it in place of plain F# to make a simple progression sound fuller.
How F#add9 differs from the chords around it
One or two notes change the whole colour. Click a chord to open its page.
Play F#add9 in a game
ChordRunner shows a chord symbol and you play it on a MIDI keyboard, a real piano through the microphone or the on-screen keys. Add9 chords come in the level "Sixth & Add Chords".
Play the demoCommon questions
How do you play F#add9 on the piano?
Press F#, A#, C# and G# together. Right hand 1 2 3 5, left hand 5 4 3 1.
What is the difference between F#add9 and F#?
F# is F# A# C#. To get F#add9, add G#, the 9th, an octave plus a whole step above F#.
Where is F#add9 used?
F#add9 fits wherever F# fits: F# major, C# major and B major. Pop and worship songs use it in place of plain F# to make a simple progression sound fuller.
Can I practise F#add9 with a MIDI keyboard or a real piano?
Yes. In ChordRunner a USB MIDI keyboard is detected automatically, and an acoustic or digital piano works through the microphone. The game checks that F#, A#, C# and G# sound together.
Your instrument is the controller.
ChordRunner is a browser game that teaches piano and guitar chords: a chord appears on screen, you play it on a real instrument, and your runner jumps. MIDI keyboard or microphone, both work.
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