|6||x or G||3rd fretfr.||optionalopt.|
Guitar chords in the key of C major:
Chord C notes: (G), C, E, G, C and E.
The note G on the sixth string is not required, but can be played on the 3rd fret if needed. The guitar strings 3(G) and 1(E) are left open.
C major chord's alternative names: CM, Cmaj, Do major, C dur.
1(C), 3(E), 5(G).