In my 20s I was so ignorant about drugs, and so naive. I mean, my band was smoking marijuana for years; I didn't even know what a joint was. And I'd never seen a line of cocaine in my life. And I don't know whether it was bravado or - OK, I'll join in. But my stupidity, I had a line of coke, and that started the whole process.

That's just a part of being an artist: you can't write great stuff all the time, because if you did, then you'd be inhuman. The human side of people is that sometimes they fail.

People who mock rap and say, "I don't like it," they should go and check out Kanye [West] in the studio rapping, or Marshall, Eminem, when he's in the studio. It's a phenomenon. Don't knock it until you've seen it. It may not be your cup of tea, but don't ridicule it.

I'm glad I've given up drugs and alcohol. It would be awful to be like Keith Richards. He's pathetic. It's like a monkey with arthritis, trying to go onstage and look young.

It took a child. It took a child with a blood transfusion not only to wake me up, but to wake America up, basically. I mean, I read about his plight in a doctor's office in New York in a magazine. I was so outraged about it that I contacted the family. We became friends. I helped them move to another place in Indiana. And we became constant friends.

I heard Little Richard and Jerry Lee Lewis, and that was it. I didn't ever want to be anything else. I just started banging away and semi-studied classical music at the Royal Academy of Music but sort of half-heartedly.

A great editor is the most valuable thing you can have as an artist because, as you said, sometimes you get too close to something. I think, apart from your talent, that's why you have the career you have - because you have great people behind you.