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C♯7♭9

C♯ 7th Flat 9 · 4 fingerings

Flattening the ninth of a dominant chord gives C♯7♭9 a dark, tense edge that pulls hard toward resolution — especially into a minor chord. It's essential jazz vocabulary for the V chord in a minor key, and it shares its notes with a diminished seventh a semitone up, which is why diminished shapes work so well over it.
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C♯7♭9 · position 1
4fr1234
C♯7♭9 · position 2 · fret 4
7fr3241
C♯7♭9 · position 3 · fret 7
9fr1324
C♯7♭9 · position 4 · fret 9