Learn › Dadd9 Chord on Piano (D Add 9)
New Released in April 2026
Dadd9 Chord on Piano (D Add 9)
Dadd9, the D add 9 chord, is the major triad D plus the 9th, E, with no seventh in between. Its notes on the piano are D, F#, A and E. In one phrase: clear and sparkling, the plain triad with one extra colour.
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 Dadd9 on the keys
Each picture is still Dadd9. Move only the notes that must move.
Root position: D E F# A
1st inversion: F# A D E
2nd inversion: A D E F#
Which fingers
| Right hand | D E F# A | 1 2 3 5 |
|---|---|---|
| Left hand | D E F# A | 5 4 3 1 |
The chord hiding inside Dadd9
Take Dsus2 (D E A) and add the third F#: you have Dadd9. That is why Dadd9 still sounds major, while Dsus2 does not.
The formula of Dadd9
Formula 1 3 5 9. Count from D and every number is a step of the D major scale, and a b lowers it by one key.
Start chord: D
| Note | Step | Interval | Keys from D |
|---|---|---|---|
| D | 1 | root | 0 |
| F# | 3 | major 3rd | 4 |
| A | 5 | perfect 5th | 7 |
| E | 9 | major 9th | 14 |
Practise Dadd9 in four steps
- Say the notes out loud while you press them: D, F#, A and E.
- Switch between D and Dadd9 ten times without looking at your hand.
- Try Dadd9 in 1st inversion, 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.
Five minutes a day is enough to make Dadd9 feel easy.
Keys and moves for Dadd9
- Dadd9 fits wherever D fits: D major, A major and G major.
- Pop and worship songs use it in place of plain D to make a simple progression sound fuller.
Train Dadd9 with ChordRunner
In ChordRunner every correct chord moves your runner forward. Plug in a MIDI keyboard or let the microphone listen to your piano. Add9 chords come in the level "Sixth & Add Chords".
Play the demoCommon questions
What is Dadd9 on the piano?
Dadd9 is the D add 9 chord: D, F#, A and E, the major triad D plus the 9th, E, with no seventh in between.
Is Dadd9 the same as Dsus2?
No. Dsus2 has no third, Dadd9 adds F#, and that one note makes Dadd9 sound major.
Where is Dadd9 used?
Dadd9 fits wherever D fits: D major, A major and G major. Pop and worship songs use it in place of plain D to make a simple progression sound fuller.
Can I practise Dadd9 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 D, F#, A and E 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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