Cmaj9 chord
The C major ninth chord (abbreviated "Cmaj9 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 major seventh chord.
In practice, the fifth (G) is sometimes omitted from the Cmaj9 chord because it's not always possible to play all notes simultaneously.
Name
C major ninth chord
Notes
C E G B D
Intervals
1 3 5 7 9
Chord symbol
Cmaj9
Alternative symbols
C▵9 Cma9 CMA9 CM9
Type
Pentad (five-note chord)