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Cycle (music)
Cycle has several meanings in the field of music. Acoustically, it refers to one complete vibration, the base unit of Hertz being one cycle per second.〔Randel, Don, "Cycle", ''The Harvard Dictionary of Music'', Cambridge, MA: Belknap Press, 1986, p. 218.〕 Theoretically, an interval cycle is a collection of pitch classes created by a sequence of identical intervals. Individual pieces that aggregate into larger works are considered cycles, for example, the movements of a suite, symphony, sonata, or string quartet.〔G. M. Tucker and Roger Parker, "Cyclic Form", The Oxford Companion to Music, edited by Alison Latham (Oxford and New York: Oxford University Press, 2001).〕 This definition can apply to everything from settings of the Mass or a song cycle to an opera cycle. Cycle also applies to the complete performance of an individual composer's work in one genre.〔"cycle." In The Oxford Companion to Music, edited by Alison Latham. Oxford Music Online, http://www.oxfordmusiconline.com/subscriber/article/opr/t114/e7623 (accessed December 25, 2011).〕
Harmonic cycles—repeated sequences of a harmonic progression—are at the root of many musical genres, such as the twelve-bar blues. In compositions of this genre, the chord progression may be repeated indefinitely, with melodic and lyrical variation forming the musical interest. The form theme and variations is essentially of this type, but generally on a larger scale.
Composition using a tone row is another example of a cycle of pitch material, although it may be more difficult to hear because the variations are more diverse.
==Rhythmic cycles==
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