Tetrad (music)

Dominant seventh chord on C: C7 Playⓘ.

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

  1. ^ See, for example, Hanson 1960, pp. 18, 22, 28, 32, et passim; Gamer 1967, pp. 37 & 52; and Forte 1985, pp. 48–51, 53
  2. ^ Forte 1973, pp. 1, 18, 68, 70, 73, 87, 88, 21, 119, 123–125, 138, 143, 171, 174, and 223.
  3. ^ Anon. 2001.
  4. ^ Roeder 2001.

References

  • 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.

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