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[[File:Dominant seventh chord on C.png|thumb|right|[[Dominant seventh chord]] on C: C<sup>7</sup> {{audio|Dominant seventh chord on C.mid|Play}}.]] |
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| ⚫ | A '''tetrad''' is a set of four [[note (music)|notes]] in [[music theory]]. When these four notes form a [[tertian]] chord they are more specifically called a ''[[seventh chord]]'', after the [[diatonic and chromatic|diatonic]] [[interval (music)|interval]] from the [[root (chord)|root]] of the [[chord (music)|chord]] to its fourth note (in root position close voicing). Four-note chords are often formed of intervals other than thirds in 20th- and 21st-century music, however, where they are more generally referred to as ''tetrads''.<ref>See, for example, {{harvnb|Hanson|1960|loc=pp. 18, 22, 28, 32, et passim}}; {{harvnb|Gamer|1967|loc=pp. 37 & 52}}; and {{harvnb|Forte|1985|loc=pp. 48–51, 53}}</ref> Musicologist Allen Forte in his ''The Structure of Atonal Music'' never uses the term "tetrad", but occasionally employs the word ''[[tetrachord]]'' to mean any collection of four [[pitch class]]es.{{sfn|Forte|1973|loc=pp. 1, 18, 68, 70, 73, 87, 88, 21, 119, 123–125, 138, 143, 171, 174, and 223}} In 20th-century music theory, such [[Set (music)|sets]] of four pitch classes are usually called "tetrachords".{{sfn|Anon.|2001}}{{sfn|Roeder|2001}} |
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==See also== |
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*[[Tetrachord]] |
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*[[Hexachord]] |
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== |
== Citations == |
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{{reflist}} |
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== References == |
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* Anonymous (2001). "Tetrachord". ''The New Grove Dictionary of Music and Musicians'', second edition, edited by [[Stanley Sadie]] and [[John Tyrrell ( |
* {{wikicite|ref={{harvid|Anon.|2001}}|reference=Anonymous (2001). "Tetrachord". ''The New Grove Dictionary of Music and Musicians'', second edition, edited by [[Stanley Sadie]] and [[John Tyrrell (musicologist)|John Tyrrell]]. London: Macmillan Publishers.}} |
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* {{wikicite|ref={{harvid|Roeder|2001}}|reference=Roeder, John (2001). "Set (ii)". ''The New Grove Dictionary of Music and Musicians'', second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.}} |
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{{Chords}} |
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{{Pitch Class Collection}} |
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{{DEFAULTSORT:Tetrad (Music)}} |
{{DEFAULTSORT:Tetrad (Music)}} |
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[[Category: |
[[Category:Musical terminology]] |
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[[Category:Simultaneities]] |
[[Category:Simultaneities (music)]] |
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[[Category:Chords]] |
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{{Music-theory-stub}} |
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[[fr:Accord de quatre notes]] |
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[[ja:四和音]] |
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[[pl:Czterodźwięk]] |
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[[uk:Септакорд]] |
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Latest revision as of 13:16, 16 December 2024
A tetrad is a set of four notes in music theory. 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 20th- and 21st-century music, however, where they are more generally referred to as tetrads.[1] Musicologist Allen Forte in his The Structure of Atonal Music never uses the term "tetrad", but occasionally employs the word tetrachord to mean any collection of four pitch classes.[2] In 20th-century music theory, such sets of four pitch classes are usually called "tetrachords".[3][4]
Citations
[edit]- ^ See, for example, Hanson 1960, pp. 18, 22, 28, 32, et passim; Gamer 1967, pp. 37 & 52; and Forte 1985, pp. 48–51, 53
- ^ Forte 1973, pp. 1, 18, 68, 70, 73, 87, 88, 21, 119, 123–125, 138, 143, 171, 174, and 223.
- ^ Anon. 2001.
- ^ Roeder 2001.
References
[edit]- Anonymous (2001). "Tetrachord". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
- 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).
- Forte, Allen (1985). "Pitch-Class Set Analysis Today". Music Analysis 4, nos. 1 & 2 (March–July: Special Issue: King's College London Music Analysis Conference 1984): 29–58.
- 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.
- Roeder, John (2001). "Set (ii)". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
