C# 9sus4 — Irish Bouzouki

C# 9sus4 is built from C# – D# – F# – G# – B. Each chart below fingers those tones across the Irish Bouzouki's four GDAD courses — press one finger and two strings speak, which is why even small shapes here sound bigger than they look.

The Irish Bouzouki's GDAD tuning is built for drones: the two D courses ring against almost any shape, so the strongest voicings here leave a course open and let the instrument do what Irish backing asks of it. Voicings are computed for this tuning by the shared voicing generator, not borrowed from another instrument; traditional technique may still use idiomatic shapes not charted here.

Learn the shape closest to the nut first, then its closed cousin up the neck — the closed version transposes to any root, and tapping a chart plays it so your ear signs off before your fingers commit.