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Encyclopedia > Perfect unison

In music, a unison is an interval, the ratio of 1:1 or 0 halfsteps and zero cents. Two tones in unison are considered to be the same pitch, but are still perceivable as coming from separate sources. The unison is considered the most consonant interval while the near unison is considered the most dissonant. The unison is also the easiest interval to tune. Composer Kenneth Gaburo wrote for three voices singing unison in his piece The Flow of (u). Music is an art, entertainment, or other human activity which involves organized sound, though definitions may vary. ... In music theory, an interval is the difference (a ratio or logarithmic measure) in pitch between two notes and often refers to those two notes themselves (otherwise known as a dyad). ... The musical interval of a half step, semitone, or minor second is the relationship between the leading tone and the first note (the root or tonic) in a major scale. ... The cent is a unit in a logarithmic scale of relative pitch or intervals. ... In music, pitch is the perception of the frequency of a note. ... Consonance is a stylistic device, often used in poetry. ... In poetry, dissonance is the deliberate avoidance of patterns of repeated vowel sounds (see assonance). ... This page is about the musical process of tuning, for musical systems of tuning see musical tuning. ... Kenneth Gaburo (July 5, 1926 in Somerville, New Jersey; - January 26, 1993 in Iowa City, Iowa) was an American composer. ...

The unison is abbreviated as P1.

A pair of tones in unison can have different "colors" (timbres), i.e. come from different musical instruments or human voices. Voices with different colors have, as sound waves, different waveforms. These waveforms have the same fundamental frequency but differ only in the amplitudes of their higher harmonics. In music, timbre is the quality of a musical note which distinguishes different types of musical instrument. ... A musical instrument is a device that has been constructed or modified with the purpose of making music. ... Waveform quite literally means the shape and form of a signal, such as a wave moving across the surface of water, or the vibration of a plucked string. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... An overtone is a sinusoidal component of a waveform, of greater frequency than its fundamental frequency. ...

When several people sing together, as in a chorus, the simplest way for them to sing is to sing in "one voice", in unison. If there is an instrument accompanying them, then the instrument must play the same notes being sung by the singers (in order for there to be unison). Otherwise the instrument is considered a separate "voice" and there is no unison. If there is no instrument, then the singing is said to be a cappella. Music in which all the notes sung are in unison is called monophonic. For the communications operator see Chorus Communications For the computer operating system see ChorusOS In classical music a chorus is any substantial group of performers in a play, revue, musical or opera who act more or less as one. ... A cappella music is vocal music or singing without instrumental accompaniment, or a piece intended to be performed in this way. ... In music, the word texture is often used in a rather vague way in reference to the overall sound of a piece of music. ...

From this sense can be derived another, figurative, sense: if several people do something "in unison" it means they do it simultaneously, in tandem, in lockstep. Related terms are "univocal" and "unanimous". In language, a metaphor is a rhetorical trope where a comparison is made between two seemingly unrelated subjects. ...

Monophony could also conceivably include more than one voice which do not sing in unison but whose pitches move in parallel, always maintaining the same interval of an octave. A pair of notes sung one or a multiple of an octave apart are almost in unison, due to octave equivalency. For the numerical computation software, see GNU Octave. ...

When there are several voices which do not usually sing in unison, then the result is polyphony. The simplest polyphony is homophony, where the voices sing notes at different pitches but with the exact same rhythm. An example is a barbershop quartet. Polyphony is a musical texture consisting of several independent melodic voices, as opposed to music with just one voice (monophony) or music with one dominant melodic voice accompanied by chords (homophony). ... Homophony is music in which the top line has a dominant melody, and all the voices accompany it with chords in the same rhythm. ... Barbershop harmony is a style of unaccompanied vocal music characterized by consonant four-part chords for every melody note in a predominantly homophonic texture. ...

See also:

# semitones Interval class # cents in equal temperament Most common diatonic name Comparable just interval # cents in just interval Just interval vs. equal-tempered interval
0 0 0 perfect unison 1:1 0 0
Other diatonic intervals
unison | minor second | major second | minor third | major third | perfect fourth | tritone | perfect fifth | minor sixth | major sixth | minor seventh | major seventh | octave

  Results from FactBites:
Perfect (219 words)
In botany and mycology, an organism is considered perfect if it is capable of sexual reproduction; otherwise it is imperfect.
A flower is called "perfect" (or synoecious) if it has both male and female reproductive parts.
Perfect intervals include the perfect octave, perfect fifth, perfect fourth, and perfect unison.
  More results at FactBites »



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