You searched for: “cacophonist
cacophonist (s) (noun), cacophonists (pl)
Someone who tends to use a combination of loud and often jarring words or sounds: When Jacob was delivering his political speech, a woman from the audience interrupted him with a critical comment and as a result, he lost his temper and suddenly became a cacophonist who yelled at her to sit down and to shut up!

The members of the orchestra were a bunch of cacophonists producing a lot of racket as they were individually tuning their musical instruments before the conductor started rehearsing.

A boy playing his violin, a dog, and a cat together represent a group cacophonists.
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The boy trying to play his violin, his dog, and the cat on the roof of the house next door; all illustrate a group of cacophonists.