You may have once heard someone tune a guitar using the harmonics, but probably have never understood how important they really are. Use the diagram on the next page to play the hamonics on the guitar.
At least one of the harmonic notes can be found in all of the chords on the previous pages. Hence, these chords are referred to as the harmonic triads. Of the chords found in research, only two, the augmented (4 4 4) and diminished (3 3 3 3), did not contain any of the harmonic notes.