Learn › Abm9 Chord on Piano (A Flat Minor 9th)
New Released in April 2026
Abm9 Chord on Piano (A Flat Minor 9th)
Abm9, the A flat minor 9th chord, is the minor seventh Abm7 plus the 9th, Bb. Its notes on the piano are Ab, Cb, Eb, Gb and Bb. Its sound: mellow and soulful, minor without sadness.
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- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
Ways to place Abm9 on the keys
Learn them in pairs: root position first, then the one that keeps the most notes still.
Both hands: Ab Gb Cb Eb Bb
Rootless, 3rd on the bottom: Cb Eb Gb Bb
Rootless, 7th on the bottom: Gb Bb Cb Eb
Left hand alone: Ab Gb
Fingering
| Left hand | Ab Gb | 5 1 |
|---|---|---|
| Right hand | Cb Eb Bb | 1 2 4 |
A second name for the same keys
The four upper notes of Abm9, Cb Eb Gb Bb, are Cbmaj7. Play Ab low and Cbmaj7 above it: that is the whole Abm9, and a quick way to reach it.
Building Abm9 from Abm7
Every chord is a recipe of scale steps. For Abm9 the recipe is 1 b3 5 b7 9, counted from Ab.
Start chord: Abm7
| Note | Step | Interval | Keys from Ab |
|---|---|---|---|
| Ab | 1 | root | 0 |
| Cb | b3 | minor 3rd | 3 |
| Eb | 5 | perfect 5th | 7 |
| Gb | b7 | minor 7th | 10 |
| Bb | 9 | major 9th | 14 |
Practise Abm9 in four steps
- Say the notes out loud while you press them: Ab, Cb, Eb, Gb and Bb.
- Switch between Abm7 and Abm9 ten times without looking at your hand.
- Try Abm9 in a rootless shape with the 3rd on the bottom, the position that sits closest to your last chord.
- Then test it in random order among other chords: recall under time pressure is what sticks.
Come back to Abm9 tomorrow: short daily sessions beat one long one.
When to play Abm9
- Abm9 is the ii chord of Gb major and the vi chord of Cb major.
- In a ii-V-I it often opens the line: Abm9 → Db7 → Gbmaj7.
Train Abm9 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 notes are in the Abm9 chord?
Abm9 has 5 notes: Ab, Cb, Eb, Gb and Bb. Formula 1 b3 5 b7 9.
What is the difference between Abm9 and Abm7?
Abm7 is Ab Cb Eb Gb. To get Abm9, add Bb above the minor seventh.
Where is Abm9 used?
Abm9 is the ii chord of Gb major and the vi chord of Cb major. In a ii-V-I it often opens the line: Abm9 → Db7 → Gbmaj7.
Can I practise Abm9 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 Ab, Cb, Eb, Gb and Bb 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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