A minor ninth chord is composed using a root/1st, minor 3rd, perfect 5th, minor 7th and major 9th (or R/1-♭3-5-♭7-9) intervals played simultaneously. Generally written as Cmi9 or Cmi7(add9), it is good practice to simply use an uppercase C, then the lowercase letters mi followed by a super scripted 9 to represent it in writing (ie: Cmi9).
Minor ninth chord profile
|Intervals||root/1st, minor 3rd, perfect 5th, minor 7th, major 9th or R/1-♭3-5-♭7-9|
|Common names (examples in C)||Cmi9, Cmi7(add9), C−9|
|D Minor ninth chord voicing #2|