tremolo

US /ˈtrem.ə.loʊ/
UK /ˈtrem.ə.loʊ/
"tremolo" picture
1.

a trembling or vibrating effect in singing or playing a musical instrument

:
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The singer added a beautiful tremolo to the final note.
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The guitarist used a tremolo bar to create a wavering sound.
:
vibratoquivershivertremor