Guitar chords in the key of C major:
Chord C9 (7th fret) notes: C, E, Bb, D and G. You should not play the 1st string.
This chord is played by placing a barre on fret seven with your index finger.
C dominant 9th guitar chord's steps:
1(C), 3(E), 5(G), b7(A#/Bb), 9(D).