9th Chord Upper StructureAbout This Lesson How to Play a 9th Chord on the Piano A 9th chord is made up of the 1 3 5 7 and 9 of a scale.  There are different kinds of 9th chords that can be created by altering the 3rd, 5th, 7th and 9th…but let’s not think about that right now! The 9th...