A
Triads · A root
A
The brightest, most stable triad. The foundation of Western tonal music.
0 st4 st7 st
Notes in A
ARoot
C#3rd
E5th
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 A, Am, A7, or another quality — the hardest and most useful ear training skill.
Major in All 12 Keys
Other Chords in A
Related Triads
About the A Chord
The A chord is a major chord built on A. It contains the notes A, C#, E — the root, third, and fifth.
The brightest, most stable triad. The foundation of Western tonal music. Practising the A 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.