C#m9 chord
The C-sharp minor ninth chord (abbreviated "C#m9 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 minor seventh chord.
In practice, the fifth (G♯) is sometimes omitted from the C#m9 chord because it's not always possible to play all notes simultaneously.
Name
C-sharp minor ninth chord
Notes
C♯ E G♯ B D♯
Intervals
1 ♭3 5 ♭7 9
Chord symbol
C♯m9
Alternative symbols
C♯–9 C♯mi9 C♯min9
Type
pentad (five-note chord)