I have this sensation of being in flight all the time, but being on stage is like creating a sanctuary in which you can completely lose yourself. The bits of your personality that you keep under wraps in ordinary life, you can let them run free.

When you're heartbroken, you're at your most creative - you have to channel all your energies into something else to not think about it. Contentment is a creativity killer, but don't worry - I'm very capable of making myself discontented.

Bono told me how to dance in high heels and he also told me about U2's Glastonbury performance and how everything that could have possibly gone wrong went wrong, including him ripping his trousers on stage. I think he was lunging and his trousers ripped! He was telling me how he had to find a new way of performing that didn't involve moving.

I've always been a bit of a decorator. I think if I wasn't a singer I'd probably be in stage setting or interior design or something. I like clutter and I'm quite visually greedy. I can't have things to be plain; I have to have things looking interesting maybe I'm just a frustrated interior designer stuck in a singing career.

In a conversation, the words can get stuck, I don't know what to say, I get very anxious.

I wanted to be a witch when I was a kid. I was obsessed with witchcraft. At school, me and my two friends had these spell books; I always wanted a more magical reality. I had a little shrine at home and I did a spell to try and make the boy in the other class fall in love with me.

I like the idea of taking off like a bird.