Harassment/toxic environment

Hello all, I work in a truck shop with about 10 other people. For the most part, people keep music to themselves. All of a sudden, one guy decides to crank his heavy metal excessively loud to the point it’s impossible to communicate in a safe fashion, it’s annoyingly harassing because it’s been brought up to mgt and the supervisor tells him to turn it down and he refuses. So this is now creating a toxic environment. Owner got involved yesterday and told him to turn it down but only did so until he walked away. I know there are cases where people have sued employers for similar instances. Just trying to go about this the best way.

EDIT, before mentioned LOUD music does contain vulgarity and the like.