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In music, a dyad consists of any two notes or pitches, emitted simultaneously, commonly known as a harmonic interval. Three pitches make up a trichord, four pitches form a tetrachord etc. A much more common and modern name for some dyads is the power chord, usually built of the root and the perfect fifth (in rock'n'roll guitar riffs, it may be replaced by the root's major sixth or minor seventh). The power chord is known to be pioneered by Link Wray.
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