Well, Led Zeppelin IV! That's it really. I'll tell you why the album had no title - because we were so fed up with the reactions to the third album, that people couldn't understand why that record wasn't a direct continuation of the second album. And then people said we were a hype and all, which was the furthest thing from what we were. So we just said, `let's put out an album with no title at all!' That way, either people like it or they don't... but we still got bad reviews!

Once I get onstage the tension explodes and I'm fine. I'm in another world - in a trance almost, doing what I love best, expressing myself through guitar.

There's music that can affect people in their lives, and they will always relate to the point that they heard it and experienced it, either if you're playing it or you're receptive, as an audience.

I'm not interested in turning anybody on to anybody that I'm turned on to... if people want to find things, they find them themselves.

I can only listen to what I'm working on, at the time. I can't listen to anything else because I don't want to copy it.

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.

You can't overthink the music. Mood and intensity can't be manufactured. The blues isn't about structure; it's what you bring to it. The spontaneity of capturing a specific moment is what drives it.