The theatre only knows what it's doing next week, not like the opera, where they say: What are we going to do in five years' time? A completely different attitude.
There are rhythmic ideas which sometimes only work up to a point. In writing there are moments when it just comes off the page, it's not just a collection of notes.
When I was confronted with official tuition, the academic thing, I could see no relationship whatever between that and the music I'd been writing since I was 11.