Rhythm
The Greek word rhythmos meant any regular recurring motion or symmetry. This general meaning of regular recurrence applies to cyclical natural phenomena with frequencies ranging from microseconds to several seconds. A rock music riff might last only a few seconds, while other rhythms span minutes, hours, or even years. The Oxford English Dictionary defines rhythm as the measured flow of words in verse. It forms patterns determined by long and short syllables within metrical feet. In performance arts, rhythm is the timing of events on a human scale. It covers musical sounds and silences over time. Dance steps follow this same timing principle. Spoken language and poetry also rely on rhythmic meter. Hip hop music uses the rhythmic delivery of lyrics as a primary stylistic element. Visual presentation can also embody rhythm through timed movement through space. Architects describe building facades using window spacing and column placement as rhythmic patterns.
Howard Goodall presented theories that human rhythm recalls walking regularity and heartbeat speed. Other research suggests emotional affect influences heartbeat rather than direct correlation. Certain features of human music are widespread enough to suggest ancient evolutionary roots for beat-based processing. Justin London writes that musical metre involves initial perception and subsequent anticipation of beats abstracted from the music surface. Joseph Jordania suggested rhythm developed during early hominid evolution via natural selection forces. Only humans possess the ability to be engaged in rhythmically coordinated vocalizations and activities. This sense of rhythm was central to achieving a neurological state called battle trance. Early hominids used rhythmic war cries and drumming by shamans to unite individuals into shared collective identities. Group members prioritized group interests above individual safety during these coordinated actions. Neurologist Oliver Sacks states no animal has been trained to tap or move in synchrony with an auditory beat. He notes that while some animals appear to dance, they may respond to subtle visual cues instead. Human rhythmic arts possibly stem from courtship rituals.
Musical sound analysis occurs across five different time scales arranged by increasing duration. Supershort cycles represent single audible waves between 30 and 10,000 Hz. These function as continuous pitch rather than separate events. Short durations measure around one second at 60 beats per minute. Musical tempo generally ranges from 40 to 240 beats per minute. A pulse faster than 8 to 10 per second becomes perceived as a drone. A succession slower than 1 per 1.5 seconds seems unconnected. Medium durations span several seconds and define rhythm in music. They allow the arrangement of accented and silent pulses into measures. Long durations cover many seconds or minutes corresponding to musical phrases. Very long durations extend over minutes or hours representing entire compositions. Curtis Roads distinguishes nine time scales including infinite natural periodicities. His Macro level encompasses overall musical architecture similar to Moravcsik's very long division. Microsound measures thousandths to millionths of seconds below audible perception thresholds. The dependence of rhythm perception on tempo creates a complex interaction loop. Context determines how listeners perceive rhythmic patterns like those in Moussorgsky's Pictures at an Exhibition.
Most music establishes an underlying metric level called the pulse or tactus. This basic unit may be audible or implied within the composition. The beat has a tempo to which listeners entrain by tapping their feet. Western notation often designates this beat as a crotchet or quarter note. Faster levels divide the beat while slower levels multiply it. Maury Yeston clarified that rhythms of recurrence arise from interacting motion levels. Once a metric hierarchy is established, listeners maintain that organization with minimal evidence. A durational pattern synchronizing with a pulse forms a rhythmic unit. These units classify as metric even patterns or intrametric confirming patterns. Contrametric patterns are syncopated and non-confirming. Extrametric patterns include irregular tuplets. Rhythms beginning on strong pulses are thetic while weak pulses create anacrustic starts. Endings on strong beats differ significantly from upbeat endings. Alternation between strong and weak beats marks regulated succession. Humans must anticipate these patterns through short memorizable repetitions. Pierre Boulez stated that beat structures beyond four are simply not natural in western music. Dance music features instantly recognizable patterns built upon characteristic tempos. The Imperial Society of Teachers of Dancing defines tango steps at 66 beats per minute.
African Griot traditions pass all musical knowledge orally without written scores. Babatunde Olatunji developed spoken sounds like Goon Doon Go to teach hand-drum rhythms. West African music relies on tension between polyrhythms created by simultaneous different rhythms. John Miller argues dominant rhythms interact with independent competing rhythms opposing each other. Collective utterances appear as drum talk or song phrases emphasizing community values. Indian classical music also passes Tala rhythmic patterns orally before performance. Tabla players learn complex rhythm phrases verbally before playing them. Sheila Chandra made performances based on singing these traditional patterns. Western composers like Igor Stravinsky and Béla Bartók wrote rhythmically complex odd meters. Philip Glass and Steve Reich utilized phasing techniques and additive rhythm. Olivier Messiaen disrupted regular beats leading to irrational rhythms in New Complexity. Henry Cowell collaborated with Leon Theremin to invent the rhythmicon electronic machine. Conlon Nancarrow composed for player pianos using multiple simultaneous periodic rhythms. Some graphically scored works since the 1950s remain ametric without meter. Christian chant maintains a basic pulse but free rhythm compared to prose.
Rhythm forms one of three aspects of prosody alongside stress and intonation in linguistics. Languages categorize themselves as syllable-timed, mora-timed, or stress-timed. Spanish and Cantonese speakers put roughly equal time on each syllable. English and Mandarin Chinese speakers place equal time lags between stressed syllables. Unstressed syllables adjust timing to accommodate stress patterns within these languages. Richard Middleton points out that current methods cannot account for syncopation fully. He suggests transformation concepts might better explain rhythmic successions. Narmour describes three categories of prosodic rules creating additive rhythmic successions. Cumulative short-long patterns associate with closure or relaxation. Countercumulative long-short patterns relate to openness or tension. Additive rhythms remain open-ended and repetitive. The study of rhythm stress and pitch in speech remains a topic in poetics. It examines line counts and syllable arrangements as long or short accented units. Music inherited the term meter from poetry terminology. This connection highlights how linguistic structures influence musical composition across cultures.
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Common questions
What does the Greek word rhythmos mean?
The Greek word rhythmos means any regular recurring motion or symmetry. This general meaning of regular recurrence applies to cyclical natural phenomena with frequencies ranging from microseconds to several seconds.
When did Howard Goodall present theories about human rhythm recalling walking regularity and heartbeat speed?
Howard Goodall presented theories that human rhythm recalls walking regularity and heartbeat speed. Other research suggests emotional affect influences heartbeat rather than direct correlation.
How many time scales does Curtis Roads distinguish in musical sound analysis?
Curtis Roads distinguishes nine time scales including infinite natural periodicities. His Macro level encompasses overall musical architecture similar to Moravcsik's very long division.
Who stated that no animal has been trained to tap or move in synchrony with an auditory beat?
Neurologist Oliver Sacks states no animal has been trained to tap or move in synchrony with an auditory beat. He notes that while some animals appear to dance, they may respond to subtle visual cues instead.
Which cultures pass all musical knowledge orally without written scores according to African Griot traditions?
African Griot traditions pass all musical knowledge orally without written scores. West African music relies on tension between polyrhythms created by simultaneous different rhythms.