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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).
They are used to add vibrato to the sound by changing the tension of the strings, typically at the bridge or tailpiece of an electric guitar using a controlling lever (often referred to as a whammy bar, vibrato arm/bar, or tremolo arm/bar).hey are used to add vibrato to the sound by changing the tension of the strings, typically at the bridge or tailpiece of an electric guitar using a controlling lever (often referred to as a whammy bar, vibrato arm/bar, or tremolo arm/bar).