Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 can be characterised by the amount of pitch variation ("depth of vibrato") and speed with which the pitch is varied ("speed of vibrato"). The terms vibrato and tremolo are sometimes used interchangeably, although the strict definitions of each describe them as separate effects: vibrato is a periodic variation in the pitch (frequency) of a musical note, whereas tremolo usually refers to periodic variations in the 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 and/or vibrato.

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