A major ninth chord is composed using a root/1st, major 3rd, perfect 5th, major 7th and major 9th (or R/1-3-5-7-9) intervals played simultaneously. Generally written as CMA9 or Cma7(add9), it is good practice to simply use an uppercase C, then the uppercase letters MA followed by a super scripted 9 to represent it in writing (ie: CMA9).
Major ninth chord profile
|Intervals||root/1st, major 3rd, perfect 5th, major 7th, major 9th or R/1-3-5-7-9|
|Common names (examples in C)||CMA9, Cma7(add9), C9|
|C Major ninth chord voicing #4|