Learn › F#maj9 Chord on Piano (F Sharp Major 9th)
New Released in April 2026
F#maj9 Chord on Piano (F Sharp Major 9th)
The F sharp major 9th chord (F#maj9) uses the piano keys F#, A#, C#, E# and G#: the major seventh F#maj7 plus the 9th, G#. Its sound: lush and calm, the classic jazz-ballad colour.
No account, no download. The demo has limited content. Advanced features are in ChordRunner Premium.
- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
How F#maj9 is built
Formula 1 3 5 7 9. Count from F# and every number is a step of the F# major scale, and a b lowers it by one key.
Start chord: F#maj7
| Note | Step | Interval | Keys from F# |
|---|---|---|---|
| F# | 1 | root | 0 |
| A# | 3 | major 3rd | 4 |
| C# | 5 | perfect 5th | 7 |
| E# | 7 | major 7th | 11 |
| G# | 9 | major 9th | 14 |
Where your hand goes for F#maj9
Learn them in pairs: root position first, then the one that keeps the most notes still.
Both hands: F# E# A# C# G#
Rootless, 3rd on the bottom: A# C# E# G#
Rootless, 7th on the bottom: E# G# A# C#
Left hand alone: F# E#
Which fingers
| Left hand | F# E# | 5 1 |
|---|---|---|
| Right hand | A# C# G# | 1 2 4 |
The chord hiding inside F#maj9
Look at the four top notes of F#maj9: A# C# E# G#. They form A#m7. So F#maj9 is F# in the bass with A#m7 on top, an easy way to find it fast.
Keys and moves for F#maj9
- F#maj9 is the I chord of F# major and the IV chord of C# major.
- It replaces F#maj7 when a song wants a softer, wider sound.
Practise F#maj9 in four steps
- Find F#, then add the other notes one at a time: F#, A#, C#, E# and G#.
- Play F#maj7, then F#maj9, then F#maj7 again, and hear what the 9th adds to the major seventh.
- Try F#maj9 in a rootless shape with the 3rd on the bottom, the position that sits closest to your last chord.
- Last, meet F#maj9 mixed with chords you already know, in an order you did not plan.
Come back to F#maj9 tomorrow: short daily sessions beat one long one.
Turn F#maj9 into a reflex
Chord symbols arrive one after another and the game checks every note you play, with MIDI or the microphone. Major and minor 9ths have their own level, "Ninth Chords".
Play the demoCommon questions
What notes are in the F#maj9 chord?
F#maj9 has 5 notes: F#, A#, C#, E# and G#. Formula 1 3 5 7 9.
What is the difference between F#maj9 and F#maj7?
F#maj7 is F# A# C# E#. To get F#maj9, add G# above the major seventh.
Where is F#maj9 used?
F#maj9 is the I chord of F# major and the IV chord of C# major. It replaces F#maj7 when a song wants a softer, wider sound.
Can I practise F#maj9 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#, E# 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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