A6/9
A Six-Nine — the sixth and ninth together — a plush, settled ending chord that never feels heavy.
The keys
A – C♯ – E – F♯ – B
What's inside A6/9
| Note | Interval from root | Degree |
|---|---|---|
| A | Root | 1 |
| C♯ | Major 3rd | 3 |
| E | Perfect 5th | 5 |
| F♯ | Major 6th | 6 |
| B | Major 9th | 9 |
A working voicing
Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:
| Hand | Keys |
|---|---|
| Left (shell) | A2 – E3 |
| Right (colour) | D♭5 – G♭5 – B5 |
Where A6/9 lives
As the I chord
A6/9 → D → E → A6/9
The classic I–IV–V–I motion with this chord as home.
In a ii–V–I
Bm7 → E7 → A6/9
The strongest cadence in harmony, resolving onto this chord.
Put A6/9 under your fingers
Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.
Open the Chord & Voicing Lab →