The C-sharp major ninth chord (abbreviated "C#maj9 chord") is a five-note chord consisting of the notes C, E, G, B, and D. The chord is formed by adding a major ninth to a C-sharp major seventh chord.

In practice, the fifth (G) is sometimes omitted from the C#maj9 chord because it's not always possible to play all notes simultaneously.

Name
C-sharp major ninth chord
Notes
C E G B D
Intervals
1 3 5 7 9
Chord symbol
Cmaj9
Alternative symbols
C9 Cma9 CMA9 CM9
Type
pentad (five-note chord)

C#maj9 chord on piano

C#maj9 chord on guitar

C#maj9 chord on ukulele

C#maj9 chord on the staff