GetWiki

{{Short description|Musical parts sounding at the same pitch}}{{other uses}}(File:Unison on C.png|thumb|Perfect unison {{audio|Unison on C.mid|Play}})In music, unison is two or more musical parts that sound either the same pitch or pitches separated by intervals of one or more octaves, usually at the same time. Rhythmic unison is another term for homorhythm.WEB, Rushton, Julian, Julian Rushton, Unison [prime],weblink Grove Music Online, Oxford University Press, subscription, May 4, 2020,

Definition

{{anchor|Divisi|Unison (orchestra)}}

factoids

.}}Unison or perfect unison (also called a prime, or perfect prime)Benward & Saker (2003), p. 53. may refer to the (pseudo-)interval formed by a tone and its duplication (in German, Unisono, Einklang, or Prime), for example C–C, as differentiated from the second, C–D, etc. In the unison the two pitches have the ratio of 1:1 or 0 half steps and zero cents. Although two tones in unison are considered to be the same pitch, they are still perceivable as coming from separate sources, whether played on instruments of a different type: {{audio|Unison piano guitar C.mid|play unison on C, piano and guitar}}; or of the same type: {{audio|Unison piano C.mid|play unison on C, two pianos}}. This is because a pair of tones in unison come from different locations or 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 in the amplitudes of their higher harmonics. 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. The unison is abbreviated as "P1".However, the unison was questioned by Zarlino as an interval for lacking contrast and compared to a point in geometry:.}}

Performance ensembles

{{Anchor|"In unison"}}{{Refimprove section|date=August 2011}}File:Twinkle Twinkle in unison.png|thumb|upright=1.5|"Twinkle, Twinkle, Little Star" melody doubled in unison. {{Audio|Twinkle Twinkle in unison.mid|Play}} clarinet & pizz. violin]](File:Twinkle Twinkle in octaves.png|thumb|upright=1.5|"Twinkle, Twinkle, Little Star" melody doubled in four octaves. {{Audio|Twinkle Twinkle in octaves.mid|Play}} piano)In orchestral music unison can mean the simultaneous playing of a note (or a series of notes constituting a melody) by different instruments, either at the same pitch; or in a different octave, for example, cello and double bass (all'unisono). Typically a section string player plays unison with the rest of the section. Occasionally the Italian word divisi (meaning divided, abbrev. div.) marks a point where an instrumental section, typically the first violins, is to be divided into two groups for rendering passages that might, for example, include full chords. Thus, in the divisi first violins the "outside" players (nearer the audience) might play the top note of the chord, while the "inside" seated players play the middle note, and the second violins play the bottom note. At the point where the first violins no longer play divisi, the score may indicate this with unison (abbrev. unis.).When an entire choir sings the main melody, the choir usually sings in unison. Music in which all the notes sung are in unison is called monophonic. In a choir with two or more sections, such as for different vocal ranges, each section typically sings in unison. Part singing is when two or more voices sing different notes. Homophony is when choir members sing different pitches but with the same rhythm. Polyphony is when the chorus sings multiple independent melodies.

Synthesizer

On synthesizers, the term unison is used to describe two or more oscillators that are slightly detuned in correspondence to each other, which makes the sound fatter.{{Clarify|date=May 2020|reason=explain unfamiliar technical term "fatter".}} This technique is so popular that some modern virtual analog synthesisers have a special oscillator type called "super saw" or "hyper saw" that generates several detuned sawtooth waves simultaneously.{{Citation needed|date=May 2020}}

See also

• List of musical intervals
• List of pitch intervals

References

{{reflist}}

Further reading

• Apel, Willi, ed., Harvard Dictionary of Music, Second Edition, Revised and Enlarged. The Belknap Press of Harvard University Press, Cambridge, Massachusetts, 1969. {{ISBN|0-674-37501-7}}.

{{Intervals}}