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In music theory, a tetrad is a set of four notes. When these four notes form a tertian chord they are more specifically called 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- and twenty-first-century music, however, where they are more generally referred to as tetrads (see, for example, Hanson 1960, ^{[page needed]}, and Gamer 1967, ^{[page needed]}). A four-note segment of a scale or twelve-tone row is more particularly known as a tetrachord,^{[citation needed]} although Allen Forte in his The Structure of Atonal Music uses the term tetrachord synonymously with tetrad.^{[page needed]}

References

Forte, Allen (1973). The Structure of Atonal Music. New Haven and London: Yale University Press. ISBN 0-300-01610-7 (cloth) ISBN 0-300-02120-8 (pbk).
Gamer, Carlton (1967). "Some Combinational Resources of Equal-Tempered Systems". Journal of Music Theory 11, no. 1:32–59.
Hanson, Howard (1960). Harmonic Materials of Modern Music: Resources of the Tempered Scale. New York: Appleton-Century-Crofts.

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-In music theory, a ''tetrad'' is a set of four notes. When these four notes form a [[tertian]] chord they are more specifically called 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- and twenty-first-century music, however, where they are more generally referred to as ''tetrads'' (see, for example, [[Howard Hanson|Hanson]] 1960, {{Page number|date=January 2010}}, and Gamer 1967, {{Page number|date=January 2010}}). A four-note segment of a scale or twelve-tone row is more particularly known as a ''tetrachord'',{{Citation needed|date=January 2010 although Allen Forte in his ''The Structure of Atonal Music'' uses the term ''tetrachord'' synonymously with ''tetrad''.{{Page number|date=January 2010}}<!--The first and possibly only place in ''The Structure'' that Forte uses the word "tetrachord" is on p. 68, and he does not there make clear in what sense he is using the term. Inferring without further evidence that his citations of 4-Z15 and 4-Z29 as "tetrachords" constitutes an equivalent with "tetrad" would constitute Original Research.-->
+In music theory, a ''tetrad'' is a set of four notes. When these four notes form a [[tertian]] chord they are more specifically called 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- and twenty-first-century music, however, where they are more generally referred to as ''tetrads'' (see, for example, [[Howard Hanson|Hanson]] 1960, {{Page number|date=January 2010}}, and Gamer 1967, {{Page number|date=January 2010}}). A four-note segment of a scale or twelve-tone row is more particularly known as a ''tetrachord'',{{Citation needed|date=January 2010}} although Allen Forte in his ''The Structure of Atonal Music'' uses the term ''tetrachord'' synonymously with ''tetrad''.{{Page number|date=January 2010}}<!--The first and possibly only place in ''The Structure'' that Forte uses the word "tetrachord" is on p. 68, and he does not there make clear in what sense he is using the term. Inferring without further evidence that his citations of 4-Z15 and 4-Z29 as "tetrachords" constitutes an equivalent with "tetrad" would constitute Original Research.-->
 ==See also==
 *[[Tetrachord]]