I used to dress like an eight-year-old boy. Traveling has inspired me to be more experimental.

I got to live out my 11-year-old fantasies - I got to go on stage with Green Day. Billie Joe called my name from the stage. 'Dookie' was the first album I ever bought. I covered the whole of 'Nimrod' and he'd heard it. That was like the 11-year-old girl dreamed.

I've been having this really weird anxiety dream about arriving too late or too early, and the people in charge are like, 'You have to leave! You have to go back to the hotel and get ready!' And I use the wrong exit, and I'm running down the red carpet in ­pyjamas, like, 'No! Don't look at me!'

On stage, you can use your emotions. It's the place where you can channel them. They have a purpose.

Where's my heart at? Aw. Um, in my chest. I think it's in there - on the right hand side. Sometimes it's in my mouth and sometimes I can feel it in my stomach, when I get really nervous. So it's pretty physical.

I always seem to feel that everything is about to cave in on me. I think that maybe music is my protection from that and in some senses it's an outlet to turn it into something euphoric: embracing the eventual decline.

I was having a conversation with my father and he was talking about this thing - strangeness and charm. It's actually the name of the two smallest particles that there are when you split the atom, so I wrote a song around it. I even managed to fit the word 'hydrogen' in there. Isn't that a nice thing for scientists to call them though?