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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).
It occurs naturally in order to protect the vocal folds. The oscillations that occur in vibrato are the body's reflexive response to mounting tension, and are believed to be the result of the healthy function of the vocal folds. The tension of the vocal folds is varied rhythmically, creating movement in pitch.