Hardcore acid techno, for all genres turned up so loud that nobody can speak and if you stand up theres a good chance that you'll shit yourself.
But seriously I hate music at games its just annoying and distracting plus most of what gamers tend to like played is boring generic rock and metal (or even worse unutterably bad death metal) which isn't something Ive been interested in since I fancied goth chicks back in the early 90's