Irish bouzouki C7 chord (GDAD)C seventh: 3 2 3 5, and 3 more shapes

Frets, low course to high: 3 2 3 5 (from the 2nd fret) · C7/Bb

1. G course: 3rd fret, middle finger, B♭
2. Low D course: 2nd fret, index finger, E
3. A course: 3rd fret, ring finger, C
4. High D course: 5th fret, little finger, G

Sounds: B♭ E C G  ·  C7 is C, E, G, B♭ (1 · 3 · 5 · ♭7)

Open courses that ring: G is a note of C7, so it can drone under it.

With a capo: on the 5th fret it’s 0 0 2 3 (frets counted from the capo), an open G7 shape.

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