Notes used in C♯ Dominant 9 Chord:C♯ + E♯ + G♯ + B + D♯
Dominant 9 chords are played combining a root, major third, perfect fifth, minor (♭) seventh, and nineth notes of the root note's major scale.
Dominant 9 Chord Formula:1 + 3 + 5 + 7♭ + 9