When comping with chords in blues and jazz, we need to think in groups of chords. All the chords below function as a C7. If a chord chart calls for a C7 any of the chords below work. Comping usually has two voicings per measure in common time. Or to put it another way, a different chord every two beats. Notice the 5th and 6th strings aren't used in any of the chords.
