It's called Blue Wrath. It's performed by I, Monster, whatever that is.
Play this video, a Youtube adaptation from the film Shaun of the Dead, three times. Turn up the volume on your computer. WARNING: the video has a BAD WORD at the start, a word so bad I won't say it, ever, and there may be gross things in it.
If you're still with me, play the video three times, and listen to the song each time. You can ignore the video, though zombie flick fan that I am, I think the movie's brilliant.
Now, try to get that song out of your head. It's been stuck in my head for two weeks.