Song from recent 'Simpsons' Episode?

What's this song from the 'Simpsons' Episode 'The Debarted?' (With the 'new kid' Donny, who's actually a rat on Bart working for Skinner.) It plays during the montage of Skinner foiling Bart's pranks, when Bart is chasing 'the rat,' and at the end of the episode. It's got kind of an 'electronic Celtic' sound to it. Not sure how else to describe it. Like violins, maybe? And the lyrics are shouted, pretty hard to understand. The only words I caught were 'BAM!' and something that sounded sorta like 'monster'?