vibrato explained
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A slight, rapid fluctuation of pitch used to enrich and warm the tone of a sustained note
Vibrato is produced differently on each instrument: string players oscillate the left-hand finger; wind players vary the air stream, embouchure, or jaw; singers pulse the larynx or diaphragm. The speed and width of vibrato vary with period, style, and personal taste. In Baroque performance, vibrato was an ornament applied selectively; by the Romantic era, continuous vibrato became the default for strings and voice. The debate over appropriate vibrato is one of the most contentious issues in historical performance practice.