Tetrad (music): Difference between revisions
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Revision as of 07:09, 8 July 2007
In music theory, a tetrad is a set of four notes. When these four notes form a tertian chord they are more particularly and more commonly referred to as a seventh chord, after the diatonic interval from the root of the chord to its fourth note (in root position close voicing). Four-note chords are often formed of intervals other than thirds in twentieth-century music, however, where they are more generally referred to as tetrads (see, for example, Howard Hanson's Harmonic Materials of Modern Music: Resources of the Tempered Scale and Carleton Gamer's, "Some Combinational Resources of Equal-Tempered Systems"). A four-note segment of a scale or twelve-tone row is more particularly known as a tetrachord, although Allen Forte in his The Structure of Atonal Music uses the term tetrachord synonymously with tetrad.
See also
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