Learn › C#m9 Chord on Piano (C Sharp Minor 9th)
New Released in April 2026
C#m9 Chord on Piano (C Sharp Minor 9th)
The C sharp minor 9th chord (C#m9) uses the piano keys C#, E, G#, B and D#: the minor seventh C#m7 plus the 9th, D#. In one phrase: smooth and deep, the warmest minor chord.
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
Where your hand goes for C#m9
Each picture is still C#m9. Move only the notes that must move.
Both hands: C# B E G# D#
Rootless, 3rd on the bottom: E G# B D#
Rootless, 7th on the bottom: B D# E G#
Left hand alone: C# B
Fingering
| Left hand | C# B | 5 1 |
|---|---|---|
| Right hand | E G# D# | 1 2 4 |
The chord hiding inside C#m9
The four upper notes of C#m9, E G# B D#, are Emaj7. Play C# low and Emaj7 above it: that is the whole C#m9, and a quick way to reach it.
Building C#m9 from C#m7
Start from C#m7, which you may already know, and change one thing: add D# above the minor seventh.
Start chord: C#m7
| Note | Step | Interval | Keys from C# |
|---|---|---|---|
| C# | 1 | root | 0 |
| E | b3 | minor 3rd | 3 |
| G# | 5 | perfect 5th | 7 |
| B | b7 | minor 7th | 10 |
| D# | 9 | major 9th | 14 |
Make C#m9 automatic
- Say the notes out loud while you press them: C#, E, G#, B and D#.
- Switch between C#m7 and C#m9 ten times without looking at your hand.
- Alternate root position and a rootless shape with the 3rd on the bottom, keeping shared notes still.
- Last, meet C#m9 mixed with chords you already know, in an order you did not plan.
Five minutes a day is enough to make C#m9 feel easy.
Where C#m9 is used
- C#m9 is the ii chord of B major and the vi chord of E major.
- In a ii-V-I it often opens the line: C#m9 → F#7 → Bmaj7.
How C#m9 differs from the chords around it
One or two notes change the whole colour. Click a chord to open its page.
Train C#m9 with ChordRunner
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 is C#m9 on the piano?
C#m9 is the C sharp minor 9th chord: C#, E, G#, B and D#, the minor seventh C#m7 plus the 9th, D#.
What is the difference between C#m9 and C#m7?
C#m7 is C# E G# B. To get C#m9, add D# above the minor seventh.
Where is C#m9 used?
C#m9 is the ii chord of B major and the vi chord of E major. In a ii-V-I it often opens the line: C#m9 → F#7 → Bmaj7.
Can I practise C#m9 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 C#, E, G#, B and D# 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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