A9 piano chord (A dominant 9th)
A – C♯ – E – G – B
Formula 1 – 3 – 5 – ♭7 – 9
A9 inversions
An inversion keeps the same notes but puts a different one at the bottom. Use them to move to the next chord with the smallest hand movement.
Root position A9
A – C♯ – E – G – B
1st inversion A9/C♯
C♯ – E – G – B – A
2nd inversion A9/E
E – G – B – A – C♯
3rd inversion A9/G
G – B – A – C♯ – E
4th inversion A9/B
B – A – C♯ – E – G
A9 chord questions
What notes are in the A dominant 9th chord?
A9 is A, C♯, E, G, B. Its formula is 1 – 3 – 5 – ♭7 – 9, counted from the root A.
How do you play A9 on piano?
With the right hand in root position, play A–C♯–E–G–B using all five fingers (1–5) (thumb on A). The full five-note shape spans more than an octave, so pianists usually play the root A in the left hand and C♯–E–G–B in the right.
What are the inversions of A9?
Root position: A–C♯–E–G–B; 1st inversion: C♯–E–G–B–A; 2nd inversion: E–G–B–A–C♯; 3rd inversion: G–B–A–C♯–E; 4th inversion: B–A–C♯–E–G.