I really wasn't needed... Just straightening up riffs, that's all. Just two guitarists doing it instead of one.

The element of change has been the thing, really. We put out the first one, then the second... then a third LP totally different from them. It's the reason we were able to keep it together.

I don't feel I have to top myself at all.

The idea of a hypnotic riff as the prime mover of a piece of music has been around for a long time, whether you're talking about the Delta blues or music from Middle Eastern and African cultures.

The way I see it, rock & roll is folk music. Street music. It isn't taught in school. It has to be picked up.

Led Zeppelin didn't get that kind of Beatles screaming. We had a more sort of macho crowd. But I remember once in the early days of The Yardbirds, we were playing on an ice rink, and the stage was mobbed by screaming girls. I had my clothes torn off me. That's a really uncomfortable experience, let me tell you.

Domesticity and all that isn't really for me.