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Vibrato is a musical effect consisting of a regular, pulsating change of pitch. It is used to add expression to vocal and instrumental music. Vibrato is typically characterised in terms of two factors: the amount of pitch variation (extent of vibrato) and the speed with which the pitch is varied (rate of vibrato).ibrato is typically characterised in terms of two factors: the amount of pitch variation (extent of vibrato) and the speed with which the pitch is varied (rate of vibrato).
In singing it can occur spontaneously through a tremor in the diaphragm or larynx. The vibrato of the string instrument and wind instrument is an imitation of that vocal function. In the organ, the vibrato is imitated by a small fluctuation of wind pressure, also known as a Tremolo or Tremulant.