It is a musical term referring to a fairly rapid, rhythmic "modulation" (variation) of pitch or amplitude in a musical note. It creates a sort of throbbing / pulsating sound. The effect can be created instrumentally on suitable instruments, and vocally by by competent singers.
A vibrato is the regular pulsating change of pitch in music,typically classed in terms of extent of pitch variation(vibrato extent) and speed of pitch varying(rate of vibrato)
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