ii–V–I
in D major
Piano chord
A Dominant 9th Piano Chord (A9)
The A Dominant 9th chord on piano is made of the notes A, C♯, E, G and B. Funky and jazzy. A dominant 7th with an added 9th.
Tap any key to hear it.
What notes are in A Dominant 9th?
5 notes, built 1 – 3 – 5 – ♭7 – 9 up from A.
- Notes
- A – C♯ – E – G – B
- Formula
- 1 – 3 – 5 – ♭7 – 9
- Semitones from the root
- 0 – 4 – 7 – 10 – 14
- Symbol
- A9
- Chord type
- Dominant 9th, 5 notes
How to play A Dominant 9th on piano
A Dominant 9th spans more than an octave, so it is usually split between the hands.
- Left hand: A and E (fingers 5 and 1).
- Right hand: C♯, G, B (fingers 1, 3 and 5).
A Dominant 9th inversions
Each inversion puts a different note of the chord in the bass. Written as a slash chord: A9/C♯, A9/E, A9/G.
Can you find A Dominant 9th?
Tap the notes on the keyboard, then check. Six chords, starting with this one.
1 / 6 Tap the notes of A Dominant 9th (A9)
Score 0
Any octave, any order. Each key you tap plays.
What key is A Dominant 9th in?
The keys whose scale contains every note of A9, with the chord’s Roman numeral in each.
Major keys
- D majorV9
Minor keys
- D minorV9 (harmonic minor)
- B minorVII9
A Dominant 9th chord FAQ
What notes are in the A Dominant 9th chord?
A Dominant 9th (A9) has 5 notes: A, C♯, E, G and B. Its formula is 1 – 3 – 5 – ♭7 – 9, counted up from A.
How do you play A Dominant 9th on the piano?
Spread it over two hands: the left hand plays A and E (fingers 5 and 1), the right hand plays C♯, G, B (fingers 1, 3 and 5).
What are the inversions of A Dominant 9th?
1st inversion: C♯, E, G, A, B (A9/C♯). 2nd inversion: E, G, A, B, C♯ (A9/E). 3rd inversion: G, A, B, C♯, E (A9/G).
What key is A Dominant 9th in?
A9 belongs to D major (V9) and B minor (VII9).