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Beat
- In physics, beat is the sum of two close frequencies as one frequency that oscillates between zero intensity and full intensity, caused by the alternating constructive and destructive interference. Beating is heard as a pulsation in loudness of two close frequencies, f2 and f2, at the rate of f1 − f2. Thus f = 0 at the unison and as the difference between f2 and f2 increases, the speed decreases till beyond a certain proximity beating stops and a roughness is heard instead, after which the two pitches are perceived as separate. The composer Alvin Lucier has written many pieces which feature interference beats as their main focus. Musicians may used interferance beats to objectively check tuning at the unison or other simple intervalss.
- In music, beat is any of the periodic transient signals in music that mark the rhythm. In particular, it can and often does take the form referred to above, caused by alternating constructive and desctructive interference of sound waves.
- Beat can also mean solely the bass and snare drums of the rhythm. DJs often beatmatch the songs that they play.
- Interference beats are used in tuning, see tuning and physics above.
- musical genre: Beat is a style played in the 1960s.
- The Beat (band), known in the US as The English Beat, was a UK ska band of the early 1980s.
- In literature beat is a genre of literature written by beatniks. See beat generation.
- In poetry, beat is sometimes used to refer to metrical feet. There is also beat poetry; see beat generation.
- police: Beat is the territory and time that a police officer patrols.
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