+**Ab9** is a [dominant ninth chord](/wiki/Dominant_ninth_chord) built upon the root A-flat. It layers a major third, perfect fifth, minor seventh, and a major ninth, creating a rich, often [jazz](/wiki/Jazz) harmony.
+## See also
+- [Chord](/wiki/Chord)
+- [Harmony](/wiki/Harmony)
+- [Ninth Chord](/wiki/Ninth_Chord)
... 1 more lines