Words or expressions describing really bad modern music

I need some words, or expressions describing tuneless, jarring, thumping, off-key music. The best word I know is cacophony. Are there better words, are there words describing the worst of specific genres?

The word describes some really bad music blaring at a bar in a scene of my novel. The music can be of any genre, but the bar is a student bar in the typical American small university town.