As many readers begin to dig deeper into learning jazz guitar harmony and voicings, you will undoubtedly come across various 9th chords, Maj9, m9, 9 etc., in your jazz-guitar explorations. Since these chords pop up time and again, it is important to have a variety of 9th chords under your fingers so that you can bring them into your comping, chord melody and chord soloing ideas when needed.