Learn › Cm9 Chord on Piano (C Minor 9th)
New Released in April 2026
Cm9 Chord on Piano (C Minor 9th)
Cm9, the C minor 9th chord, is the minor seventh Cm7 plus the 9th, D. Its notes on the piano are C, Eb, G, Bb and D. Expect a sound that is mellow and soulful, minor without sadness.
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 Cm9
Learn them in pairs: root position first, then the one that keeps the most notes still.
Both hands: C Bb Eb G D
Rootless, 3rd on the bottom: Eb G Bb D
Rootless, 7th on the bottom: Bb D Eb G
Left hand alone: C Bb
Hands and fingers
| Left hand | C Bb | 5 1 |
|---|---|---|
| Right hand | Eb G D | 1 2 4 |
The chord hiding inside Cm9
The four upper notes of Cm9, Eb G Bb D, are Ebmaj7. Play C low and Ebmaj7 above it: that is the whole Cm9, and a quick way to reach it.
The formula of Cm9
Start from Cm7, which you may already know, and change one thing: add D above the minor seventh.
Start chord: Cm7
| Note | Step | Interval | Keys from C |
|---|---|---|---|
| C | 1 | root | 0 |
| Eb | b3 | minor 3rd | 3 |
| G | 5 | perfect 5th | 7 |
| Bb | b7 | minor 7th | 10 |
| D | 9 | major 9th | 14 |
Make Cm9 automatic
- Say the notes out loud while you press them: C, Eb, G, Bb and D.
- Play Cm7, then Cm9, then Cm7 again, and hear what the 9th adds to the minor seventh.
- Try Cm9 in a rootless shape with the 3rd on the bottom, the position that sits closest to your last chord.
- Last, meet Cm9 mixed with chords you already know, in an order you did not plan.
Keep each session short and frequent and Cm9 will become automatic.
Where Cm9 is used
- Cm9 is the ii chord of Bb major and the vi chord of Eb major.
- In a ii-V-I it often opens the line: Cm9 → F7 → Bbmaj7.
Turn Cm9 into a reflex
In ChordRunner every correct chord moves your runner forward. Plug in a MIDI keyboard or let the microphone listen to your piano. Major and minor 9ths have their own level, "Ninth Chords".
Play the demoCommon questions
How do you play Cm9 on the piano?
Press C, Eb, G, Bb and D together. Left hand plays C Bb (fingers 5 and 1), right hand Eb G D (1, 2, 4).
What is the difference between Cm9 and Cm7?
Cm7 is C Eb G Bb. To get Cm9, add D above the minor seventh.
Where is Cm9 used?
Cm9 is the ii chord of Bb major and the vi chord of Eb major. In a ii-V-I it often opens the line: Cm9 → F7 → Bbmaj7.
Can I practise Cm9 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, Eb, G, Bb 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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