Chord · A 6/9
A6/9 Chord
A6/9 is A, C#, E, F# and B — lush, neutral substitute for major triads.
A6/9 on every instrument
The same 5 notes, 2 sets of hands. Open a diagram for alternate shapes, audio and the mistakes to avoid.
What A6/9 is made of
A6/9 (A six nine) is built from the notes A, C#, E, F#, B, with the interval pattern 1, 3, 5, 6, 9.
Stack 1, 3, 5, 6 and 9 on a root of A and you get A, C#, E, F# and B. That interval recipe is what makes the chord a six nine chord — move the same shape to another root and the character travels with it, which is why C6/9 sounds like a transposed A6/9.
6/9: Lush, neutral substitute for major triads.
Spelling: the notes above are written the way a score would write them, not simplified to the nearest piano key. That is why this chord is spelled with C♯ rather than its enharmonic equivalent.
Keys that contain A6/9
All 5 notes sit inside the scale of 6 keys. The roman numeral marks the degree the chord is rooted on.
Other chords on A
Same root, different colour.
The same six nine shape, moved
The identical interval recipe, built on other roots.
Questions people ask about A6/9
- What notes are in the A6/9 chord?
- A6/9 is made of A, C#, E, F# and B — the 1, 3, 5, 6 and 9 degrees of a six nine chord built on A.
- What keys use the A6/9 chord?
- Every note of A6/9 belongs to 6 keys: D Major (V), A Major (I), E Major (IV), B Minor (VII), F# Minor (III), C# Minor (VI). The roman numeral is the scale degree the chord is rooted on.
- How do you play A6/9 on guitar and piano?
- This page shows A6/9 on guitar and piano — 5 voicings in total. Each diagram links to the full instrument page with alternate shapes, audio and common mistakes.
Learn the theory behind it
Why A6/9 behaves the way it does — the guides that explain the chord instead of just spelling it.