"When you look back on a historical period of music, it seems so obvious to you what the characteristics of it are, but they're not obvious at the time. So, when I look back at my own work, I could easily write a very convincing sort of account of it that made it look like I had planned it all out from day one and that this led logically to that and then I did this and then that followed quite naturally from that. But that's not how it felt."