C 7#9 Chord on 12-String Guitar
Play C 7#9 on 12-String Guitar: diagrams, finger positions, intervals, and every voicing up and down the neck for this instrument.
The C 7#9 chord is an extended or altered dominant that stacks ninths, elevenths, thirteenths, or chromatic tensions over a dominant-seventh core. It is built from the notes C, D#, E, G, A#. This page shows how to play C 7#9 on 12-String Guitar with clear fretboard diagrams and suggested finger positions.
The lowest shape sits at fret 8 and spans 4 frets, with no open strings in it. C falls on the E string. It sounds from C3 up to D#5.
12-String Guitar is strung in six courses of two, the lower four paired an octave apart, so each stopped note here sounds as two — which is why the shape rings thicker than the same grip on a single-strung instrument.
Browse alternate voicings to find the one that sits best under your fingers, then compare it with the other chord types built on C or explore the same shape in nearby keys. The diagrams list the notes in each voicing so you can connect the shape to the theory behind it.