I don't know whether I'll reach 40. I don't know whether I'll reach 35. I can't be sure about that. I am bloody serious. I am very, very serious. I didn't think I'd make 30.

I'm attracted by the unknown, but I take precautions.

I know where I'm going musically. I can see my pattern and I'm going much slower than I thought I'd be going.

There's always music that moves me. It doesn't necessarily mean that it's within the parenthesis of rock or blues, or whatever. It's usually far more reaching than that. It can be in many different genres.

When you hear the melodic structures of what classical musicians put together and you compare it to that of a rock & roll record, there's a hell of a long way rock & roll has to go.

(The Song Remains The Same) is not a great film, but there's no point in making excuses. It's just a reasonably honest statement of where we were at that particular time. It's very difficult for me to watch it now, but I'd like to see it in a year's time just to see how it stands up.

Many people think of me as just a riff guitarist, but I think of myself in broader terms. As a musician I think my greatest achievement has been to create unexpected melodies and harmonies within a rock and roll framework. And as a producer I would like to be remembered as someone who was able to sustain a band of unquestionable individual talent, and push it to the forefront during its working career. I think I really captured the best of our output, growth, change and maturity on tape - the multifaceted gem that is Led Zeppelin.