Learn › Abadd9 Chord on Piano (A Flat Add 9)
New Released in April 2026
Abadd9 Chord on Piano (A Flat Add 9)
Abadd9, the A flat add 9 chord, is the major triad Ab plus the 9th, Bb, with no seventh in between. Its notes on the piano are Ab, C, Eb and Bb. Its sound: wide and shiny, a major chord with a ring on top.
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
Ways to place Abadd9 on the keys
Learn them in pairs: root position first, then the one that keeps the most notes still.
Root position: Ab Bb C Eb
1st inversion: C Eb Ab Bb
2nd inversion: Eb Ab Bb C
Fingering
| Right hand | Ab Bb C Eb | 1 2 3 5 |
|---|---|---|
| Left hand | Ab Bb C Eb | 5 4 3 1 |
A second name for the same keys
Take Absus2 (Ab Bb Eb) and add the third C: you have Abadd9. That is why Abadd9 still sounds major, while Absus2 does not.
Building Abadd9 from Ab
Every chord is a recipe of scale steps. For Abadd9 the recipe is 1 3 5 9, counted from Ab.
Start chord: Ab
| Note | Step | Interval | Keys from Ab |
|---|---|---|---|
| Ab | 1 | root | 0 |
| C | 3 | major 3rd | 4 |
| Eb | 5 | perfect 5th | 7 |
| Bb | 9 | major 9th | 14 |
Practise Abadd9 in four steps
- Find Ab, then add the other notes one at a time: Ab, C, Eb and Bb.
- Play Ab, then Abadd9, then Ab again, and hear what the 9th adds on top.
- Alternate root position and 1st inversion, keeping shared notes still.
- Last, meet Abadd9 mixed with chords you already know, in an order you did not plan.
Come back to Abadd9 tomorrow: short daily sessions beat one long one.
When to play Abadd9
- Abadd9 fits wherever Ab fits: Ab major, Eb major and Db major.
- Pop and worship songs use it in place of plain Ab to make a simple progression sound fuller.
Train Abadd9 with ChordRunner
Chord symbols arrive one after another and the game checks every note you play, with MIDI or the microphone. Add9 chords come in the level "Sixth & Add Chords".
Play the demoCommon questions
What notes are in the Abadd9 chord?
Abadd9 has 4 notes: Ab, C, Eb and Bb. Formula 1 3 5 9.
Is Abadd9 the same as Absus2?
No. Absus2 has no third, Abadd9 adds C, and that one note makes Abadd9 sound major.
Where is Abadd9 used?
Abadd9 fits wherever Ab fits: Ab major, Eb major and Db major. Pop and worship songs use it in place of plain Ab to make a simple progression sound fuller.
Can I practise Abadd9 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 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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