Mate of mine used to sing a song called 'I'm sorry, I've forgotten the words'. I will look it out and maybe post it - might be useful to you (or anyone). He write quite a few, including 'Matty's new restaraunt' - a parody of a will known song! And a monologue called 'The Polite Force'. But I am long out of touch with him, so I can't ask his permission.