Apart from the first set - which used high-level concert lighting - once you stepped into the two narrative pieces, we were working with lower-level theatrical lights. In most cases, people were really respectful of that.

As an artist, you're never happy with anything you do. It's part of the process.

When I was singing "King of the Mountain," it was a pivotal point in the show. That's the song that took us from this concert setting of individual songs into the theatrical narrative piece.

Its so fascinating to think about how each snowflake is completely individual - there are millions and millions of them, but each one is so unique.

If ever there's been somebody to hold as an icon of sheer determination and willpower, it's that guy [Stephen Hawking ], let alone any of the things he's done scientifically. I'm sure that's his driving force, but he's a miracle and an aspiration.

I was so nervous every night that I had to really focus and keep myself in that moment so that I would not forget the words. I was really present for every song.

What made it special made it dangerous, so I bury it... and forget.