That's easy. The Necks - Drive By Well, any one hour Necks track would do, but that's one of the simplest. I love their concept by the way - it does change and evolve, but so slowly that you only notice it if you fast forward some minutes.
Because of that, if you don't actually concentrate on it, it just slips out of your mind. And in your scenario, the gun pointed on me would be enough of a distraction to never ever notice the music again. :)
EDIT: Or maybe the 'leekspin'. Once I left it going for hours and didn't get mad. At least noone told me that I'm considerably worse.