The episode is pretty engaging though I couldn't get the message when I was young (actually I still can't - maybe it's about trust and you shouldn't trust some random people and random things). But the point is that the episode introduced "the Lily theme", which was later used in lots of other episodes. It became part of my childhood and will always remember it. So recently I've rewatched doctor who series 5 and guess what??? The mad man with a box + the sad man with a box have the same notes. I was like What??? They're really similar, what have you done, murray???? But anyways thanks Murray, you made a wonderful score even more wonderful (and longer)