A Dominant 9 Chord: A9 (Also: Adom9) Parent Chord: Dominant 7 Intervals: M3, m3, m3, M3 C, E, G, Bb, D Key: C F Bb Eb Ab Db Gb B E A D G Related Scales/Modes: A Mixolydian The major scale and its modes is the most commonly-used scale in western music. Popular Voicings for Dominant 9 (See All 3): Shell I Type I Type II