C♯9♭5
C♯ 9th Flat 5 · 3 fingerings
A dominant ninth with a flattened fifth, C♯9♭5 combines the richness of the ninth with the ambiguity of the lowered fifth. It's firmly jazz and fusion vocabulary, generally used as a tense dominant heading somewhere else, and it maps neatly onto whole-tone thinking. A specialist colour rather than an everyday chord.
C♯9♭5 · position 1
C♯9♭5 · position 2 · fret 8
C♯9♭5 · position 3 · fret 9