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vibrato
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").
In singing it can occur spontaneously through a variations in the larynx. The vibrato of a string instrument and wind instrument is an imitation of that vocal function.
==Vibrato and tremolo==
The terms vibrato and tremolo are sometimes incorrectly used interchangeably, although they are properly defined as separate effects with vibrato defined as a periodic variation in the pitch (frequency) of a musical note, and tremolo a periodic variation in volume (amplitude) of a musical note. In practice, it is difficult for a singer or musical instrument player to achieve a pure vibrato or tremolo (where only the pitch or only the volume is varied), and variations in both pitch and volume will often be achieved at the same time. Electronic manipulation or generation of signals makes it easier to achieve or demonstrate pure tremolo or vibrato.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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