My greatest experiences in the theatre and the most religious experiences in my life - of which going to the opera is one for me - have been with the Romantic composers' repertoire: it's Wagner, it's Strauss, Verdi, Puccini. That era gets me every time.

I'm not born again, I'm not Kabbalah, God forbid, but I did have an experience hitting 30 that I needed to lean on something that assured me that everything is going to be okay. I had to regain a lot of my belief in fairy tales, in happy endings.

You know the question: 'How do you get to Carnegie Hall?' Answer: 'Practise?' Well, in my case, I got there by not practising. I didn't finish my music degree. And when I got into the pop world, I decided not to conform because I figured that the point of being an artist was that you shouldn't be like anyone else.

You had to be an over-the-top, demanding, dramatic figure in order to progress as a woman in Europe over the last few hundred years. Now people say, "You're being such a prima donna," meaning you're being hard to deal with or crazy. It's a bit sexist.

I'm very fit on tour. I try to eat well, try to sleep. But it's still rock n' roll.

For me, the iPhone is harder than reading Faust.

I just think it's better to have ideas. I mean, you can change an idea. Changing a belief is trickier, people die for them, people kill for them.