@CountArthurStrong How rude of me, I was going to reply and then completely forgot! Curved Air rang a bell with me and I couldn’t think why… Francis Monkman, he’s the reason. A friend at university had this album, and after a discussion about SKY - "Where Opposites Meet" is still one of my favourite pieces of music - he let me borrow it. I found most of it quite impenetrable, but having listened to it again following your prompt I can appreciate it more now I’m older.