The theme tune is one of the things that sets the scene for every TV show - the twanging guitar at the start of Breaking Bad, the epic and iconic Game Of Thrones theme, and that light-hearted pop-rock song at the start of Friends.
So what happens if you take that track, 'I'll Be There For You' by The Rembrandts, and apply it to gritty zombie series The Walking Dead?
You get a very different show, with some slightly less intense zombie murders.