Power chords are constructed by playing a root, perfect fifth and, in some cases, perfect octave. Because the chord does not contain a third, the major and minor qualities are not present. They are generally played on electric guitar and are used extensively in rock music, especially heavy metal and punk rock, where heavy amounts of distortion are used. Because distortion adds a great deal of harmonic content to an electric guitar's timbre, perfect intervals are the only intervals with enough consonance to be clearly articulated and perceived at high distortion levels. Even the addition of a third can cause a chord to sound dissonant.

Ian



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