Inversions
This chord spans more than an octave, so it is usually played in root position and shared between the hands.
About this chord
Its formula is 1 3 5 ♭7 9: the major third (M3), perfect fifth (P5), minor seventh (m7) and major ninth (M9) above the root, A.
Counted in semitones from A, its notes are 0, 4, 7, 10, 14.
A dominant 9th chord adds the ninth to a dominant 7th. It keeps the pull of the V7 with a fuller sound, and is common in blues, funk and jazz.
In major keys it is V9 in D major.
In natural minor keys it is VII9 in B minor.
It spans more than an octave, so share it between the hands: the left hand plays A and the right hand plays C♯ E G B.
Find the root first, place the other fingers over the coloured keys, then press them all together so every note sounds at the same time.
Questions and answers
What notes are in the A dominant 9th chord?
The A9 chord has five notes: A, C♯, E, G and B. Counted from the root, its formula is 1-3-5-♭7-9.
What is the fingering for the A9 chord?
It spans more than an octave, so share it between the hands: the left hand plays A and the right hand plays C♯ E G B.
Which keys contain the A9 chord?
In major keys it is V9 in D major. In natural minor keys it is VII9 in B minor.
In other keys
The chord list follows pianochord.io by Enkai Ji, used under the MIT licence. Licence