Duration
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2008-07-16T09:57:51Z
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A '''duration''' is an [[quantity|amount]] of [[time]] or a particular time [[Interval (time)|interval]]. For example, an event in the common sense has a duration greater than zero (but not very long), but in certain specialized senses (such as in [[spacetime#Basic concepts|the theory of relativity]]), a duration of zero. It is often cited as one of the fundamental aspects of [[music]], see also [[rhythm]].
Durations, and their beginnings and endings, may be described as long, short, or taking a specific amount of time. Often duration is described according to terms borrowed from descriptions of [[pitch (music)|pitch]]. As such, the ''duration [[Complement (music)|complement]]'' is the amount of different durations used, the '''duration scale''' is an ordering ([[Scale (measurement)|scale]]) of those durations from shortest to longest, the ''duration [[Range (music)|range]]'' is the difference in length between the shortest and longest, and the ''duration [[hierarchy]]'' is an ordering of those durations based on frequency of use (DeLone et al. (Eds.), 1975, chap. 3).
'''Durational patterns''' are the foreground details projected against a background [[metric structure]], which includes [[metre (music)|meter]], [[tempo]], and all rhythmic aspects which produce temporal regularity or structure. Duration patterns may be divided into [[rhythmic unit]]s and [[rhythmic gesture]]s. (DeLone et al. (Eds.), 1975, chap. 3) However, they may also be described using terms borrowed from the [[metrical feet]] of poetry: [[iamb]] (weak-strong), [[anapest]] (weak-weak-strong), [[trochee]] (strong-weak), [[dactyl (poetry)|dactyl]] (strong-weak-weak), and [[amphibrach]] (weak-strong-weak), which may overlap to explain ambigouity (Cooper and Meyer, 1960).
==See also==
*[[Time scale (music)]].
==References==
*Cooper and Meyer (1960). ''The Rhythmic Structure of Music''. University of Chicago Press. ISBN 0-226-11522-4. Cited in Delone directly below.
*DeLone et al. (Eds.) (1975). ''Aspects of Twentieth-Century Music''. Englewood Cliffs, New Jersey: Prentice-Hall. ISBN 0-13-049346-5.
{{Time Topics}}
{{Time measurement and standards}}
[[Category:Aspects of music]]
[[Category:Time]]
[[de:Dauer]]
[[fr:Periode]]
[[pt:duração]]
[[ru:Длительность звука]]
[[uk:Тривалості (музика)]]