From the AP wire:

FALLUJAH, Iraq - In Fallujah's darkened, empty streets, U.S. troops blast AC/DC's "Hell's Bells" and other rock music full volume from a huge speaker, hoping to grate on the nerves of this Sunni Muslim city's gunmen and give a laugh to Marines along the front line.

...What music would you play to drive an enemy (or cube mate) crazy? I'm thinking that AC/DC, albeit grating and annoying, isn't quite enough to be truly cruel....Some nice Britney Spears, perhaps... via [/\ndy's Weblog]

I wonder if part of it isn't using music that's grating but culturally acceptable to your own troops as an echo / background. ("Hey, Guns N Roses is next!") But if you just want to drive them insane, I'm thinking a Celine Dion loop ought to do it.