Learn › Abmaj9 Chord on Piano (A Flat Major 9th)
New Released in April 2026
Abmaj9 Chord on Piano (A Flat Major 9th)
The A flat major 9th chord (Abmaj9) uses the piano keys Ab, C, Eb, G and Bb: the major seventh Abmaj7 plus the 9th, Bb. In one phrase: soft, dreamy and very open.
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- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
How Abmaj9 is built
Start from Abmaj7, which you may already know, and change one thing: add Bb above the major seventh.
Start chord: Abmaj7
| Note | Step | Interval | Keys from Ab |
|---|---|---|---|
| Ab | 1 | root | 0 |
| C | 3 | major 3rd | 4 |
| Eb | 5 | perfect 5th | 7 |
| G | 7 | major 7th | 11 |
| Bb | 9 | major 9th | 14 |
Where your hand goes for Abmaj9
Each picture is still Abmaj9. Move only the notes that must move.
Both hands: Ab G C Eb Bb
Rootless, 3rd on the bottom: C Eb G Bb
Rootless, 7th on the bottom: G Bb C Eb
Left hand alone: Ab G
Hands and fingers
| Left hand | Ab G | 5 1 |
|---|---|---|
| Right hand | C Eb Bb | 1 2 4 |
Abmaj9 and Cm7
Look at the four top notes of Abmaj9: C Eb G Bb. They form Cm7. So Abmaj9 is Ab in the bass with Cm7 on top, an easy way to find it fast.
Keys and moves for Abmaj9
- Abmaj9 is the I chord of Ab major and the IV chord of Eb major.
- It replaces Abmaj7 when a song wants a softer, wider sound.
Make Abmaj9 automatic
- Find Ab, then add the other notes one at a time: Ab, C, Eb, G and Bb.
- Play Abmaj7, then Abmaj9, then Abmaj7 again, and hear what the 9th adds to the major seventh.
- Alternate root position and a rootless shape with the 3rd on the bottom, keeping shared notes still.
- Last, meet Abmaj9 mixed with chords you already know, in an order you did not plan.
Five minutes a day is enough to make Abmaj9 feel easy.
Play Abmaj9 in a game
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
What is Abmaj9 on the piano?
Abmaj9 is the A flat major 9th chord: Ab, C, Eb, G and Bb, the major seventh Abmaj7 plus the 9th, Bb.
Is Abmaj9 the same as Cm7?
Not quite: Cm7 (C Eb G Bb) is only the upper part of Abmaj9. Add Ab underneath and you have the full Abmaj9.
Where is Abmaj9 used?
Abmaj9 is the I chord of Ab major and the IV chord of Eb major. It replaces Abmaj7 when a song wants a softer, wider sound.
Can I practise Abmaj9 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, C, Eb, G 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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