WTF *is* that?

Hearing the telly on downstairs has reminded me of something. What the buggery fuck is that music on the Lockets (or some kind of cold medication anyway) advert? It starts with all luvverly and tinkly piano stuff then there's someone screaming at the end, just for a second. Is it from a song? It sounds like James Blunt with a bit of Kelis' 'I hate you so much right now' tagged on the end. Which I'm sure would be entirely appropriate for some people...

Maybe its James but with an axe wielding psycho bitch running into his recording studio just as he's about to sing.