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!

Everything that came later... the roots are all there in the first album.

My vocation is more in composition really than anything else-building up harmonies using the guitar, orchestrating the guitar like an army, a guitar army. ... I always felt if we were going in to do an album, there should already be a lot of structure already made up so we could get on with that and see what else happened. ... I always believed in the music we did and that's why it was uncompromising. ... I don't think the critics could understand what we were doing.

You can't just find yourself doing something and not happy doing it.

If I ever really felt depressed, I would just start putting on all my old records that I played as a kid, because the whole thing that really lifted me then still lifted me during those other times. It was good medicine for me, and it still does that for me when I put something on. Isn't it wonderful that we've got all that good medicine? I think it's got to be all part of our DNA, this mass communication through music. That's what it is. It's got to be, hasn't it? Music is the one thing that has been consistently there for me. It hasn't let me down.

The gut-strung guitar, the classical guitar, that is a whole different world on its own. When you think what the guitar can do and what every individual player does with a guitar, everyone has their own identity coming through the guitar.

I played guitar all my life, all the way through the Yardbirds, but I knew that for me this was going to be a guitar vehicle, because that's what I wanted it to be.