Irish bouzouki Aadd9 chord (GDAD)A added ninth: 6 7 7 9, and 2 more shapes

Frets, low course to high: 6 7 7 9 (from the 6th fret) · Aadd9/C#

1. G course: 6th fret, index finger, C♯
2. Low D course: 7th fret, middle finger, A
3. A course: 7th fret, ring finger, E
4. High D course: 9th fret, little finger, B

Sounds: C♯ A E B  ·  Aadd9 is A, C♯, E, B (1 · 3 · 5 · 9)

Open courses that ring: A is a note of Aadd9, so it can drone under it.

With a capo: on the 2nd fret it’s 4 0 0 5 (frets counted from the capo), an open Gadd9 shape.

Tuning GDAD: G D A D, low to high.