A technical knowledge of harmony is not an absolute prerequisite to the enjoyment of music, but the amateur musician and listener alike should be aware of harmony as an element of guitar chord structure. He should be cognizant of certain basic principles, properties and uses of this element.
Harmony as an element is more sophisticated than rhythm and melody. It was virtually non-existent in primitive cultures. It is an element which appeared comparatively late in the history of music and was developed primarily in western civilization.
Harmony is a musical element based on the simultaneous combination of musical tones (as distinguished from the consecutive tones of a melody), or the accompaniment of a melody using chords.
A combination of three or more tones, played simultaneously and perceived as sounding as a whole is called a chord.
A few rudimentary principles will help you understand the nature of conventional chord construction. The simplest chord is the major triad, which consists of three tones. We can build a triad by selecting the tones of a certain major scale and by adding two or more tones above it in alternate degrees of the original scale. For example, if we start with the tone C as