What's the noun for vibrato? Here's the word you're looking for.
vibrato
(music) The musical effect or technique where the pitch or frequency of a note or sound is quickly and repeatedly raised and lowered over a small distance for the duration of that note or sound.
“Gretsch also owns and manufactures some of the other most popular and historic music industry products and brands including Bigsby Vibratos and Sho-Bud Pedal Steel Guitars.”