Guitar chords in the key of C major:
C Dm Em F G Am Bdim

Chord C7-5 notes: C, Gb, Bb and E. You must leave out the 6th and 1st strings.

This chord is played by placing a barre on fret three with your index finger.

C dominant 7th flat 5th guitar chord's alternative names: C7b5, Cdom7b5.

Steps: 1-3-b5-b7.
1(C), 3(E), b5(F#/Gb), b7(A#/Bb).