A9
Extended · A root
A9
A dominant 7th with an added 9th. Funky and full of energy.
0 st4 st7 st10 st14 st
Notes in A9
ARoot
C#3rd
E5th
G7th
B9th
A is the reference pitch (A440). Very common in rock and pop — the vi chord in C major.
Identify the Chord Quality on A
Each chord below is played on A. Listen and identify whether you heard A9, Am, A7, or another quality — the hardest and most useful ear training skill.
Dominant 9th in All 12 Keys
Other Chords in A
Related Extended
About the A9 Chord
The A9 chord is a dominant 9th chord built on A. It contains the notes A, C#, E, G, B — the root, third, fifth, seventh, and extensions.
A dominant 7th with an added 9th. Funky and full of energy. Practising the A9 chord across different voicings and contexts builds the harmonic recognition that lets you identify it instantly in any musical setting — whether in a band mix, a recording, or a live performance.