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( Unison)
In music, a unison ( play unison on C, two pianos&_160;(help·info) play unison on C, piano and guitar&_160;(help·info) ) is an interval, the ratio of 11 or 0 half steps 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. 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. 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.
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