C# maj9 Chord on Octave Mandolin
How to play the C# maj9 chord on Octave Mandolin: fretboard diagrams, finger positions, the notes that build it, and alternate voicings up the neck.
The C# maj9 chord is a major extended chord that stacks ninths, elevenths, or thirteenths over a major-seventh foundation for a rich, jazzy color. It is built from the notes C#, D#, F, G#, C. This page shows how to play C# maj9 on Octave Mandolin with clear fretboard diagrams and suggested finger positions.
The lowest shape sits at fret 1 and spans 5 frets, with no open strings in it. C# falls on the A string. It sounds from C3 up to F4.
Octave Mandolin is strung in four courses of two, 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.