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Rhythm (from Greek ῥυθμός, ''rhythmos'', "any regular recurring motion, symmetry" ) generally means a "movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions" . This general meaning of regular recurrence or pattern in time can apply to a wide variety of cyclical natural phenomena having a periodicity or frequency of anything from microseconds to millions of years. In the performance arts rhythm is the timing of events on a human scale; of musical sounds and silences, of the steps of a dance, or the meter of spoken language and poetry. Rhythm may also refer to visual presentation, as "timed movement through space" (, ) and a common language of pattern unites rhythm with geometry. In recent years, rhythm and meter have become an important area of research among music scholars. Recent work in these areas includes books by Maury Yeston , Fred Lerdahl and Ray Jackendoff, Jonathan Kramer, Christopher Hasty , Godfried Toussaint , William Rothstein, and Joel Lester . In ''Thinking and Destiny'', Harold W. Percival defined rhythm as the character and meaning of thought expressed through the measure or movement in sound or form, or by written signs or words . ==Anthropology== In his television series ''How Music Works'', Howard Goodall presents theories that human rhythm recalls the regularity with which we walk and the heartbeat . Other research suggests that it does not relate to the heartbeat directly, but rather the speed of emotional affect, which also influences heartbeat. Yet other researchers suggest that since certain features of human music are widespread, it is reasonable to suspect that beat-based rhythmic processing has ancient evolutionary roots (, ). Justin London writes that musical metre "involves our initial perception as well as subsequent anticipation of a series of beats that we abstract from the rhythm surface of the music as it unfolds in time" . The "perception" and "abstraction" of rhythmic measure is the foundation of human instinctive musical participation, as when we divide a series of identical clock-ticks into "tick-tock-tick-tock" (; ). The establishment of a basic beat requires the perception of a regular sequence of distinct short-duration pulses and, as subjective perception of loudness is relative to background noise levels, a pulse must decay to silence before the next occurs if it is to be really distinct. For this reason the fast-transient sounds of percussion instruments lend themselves to the definition of rhythm. Musical cultures that rely upon such instruments may develop multi-layered polyrhythm and simultaneous rhythms in more than one time signature, called polymeter. Such are the cross-rhythms of Sub-Saharan Africa and the interlocking ''kotekan'' rhythms of the ''gamelan''. For information on rhythm in Indian music see Tala (music). For other Asian approaches to rhythm see Rhythm in Persian music, Rhythm in Arabian music and ''Usul''—Rhythm in Turkish music and Dumbek rhythms. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rhythm」の詳細全文を読む スポンサード リンク
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