Ever hear the Grosse Fugue? It’s as discordant as any contemporary music.
http://www.youtube.com/watch?v=6s0Mp7LFI-k
Maybe that is why it is gross.;-)
Years ago, on a Classical music radio station, they played some modern symphony that was so bad it mad Rite of Spring sound good! It was torture to listen to it. Kind of like something by THE BLACK ANGELS would do only worse.
I read several years later that some symphony members were trying to sue the company for disability because the sudden change in musical notes caused them “irreparable harm” and stress.