There was no working title for the album. The record-jacket designer said `When I think of the group, I always think of power and force. There's a definite presence there.' That was it. He wanted to call it `Obelisk'. To me, it was more important what was behind the obelisk. The cover is very tongue-in-cheek, to be quite honest. Sort of a joke on 2001. I think it's quite amusing.

I believe every guitar player inherently has something unique about their playing. They just have to identify what makes them different and develop it.

I'm trying to photosynthesize like a plant. I'm off eating. Although I am making a lot of banana daiquiries in my room in the blender I've got, with lots of powdered vitamins in them. This tour I'm going to get some Afghani hangings and put them in my room, so that my hotel rooms look like mosques.

But if you want me to knock Kingdom Come, all I will say is that I heard the guitarist said he'd never heard my playing, and I'd defy any guitarist in American not to have heard Led Zeppelin.

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.

Right from the first time we went to America in 1968, Led Zeppelin was a word-of-mouth thing. You can't really compare it to how it is today.

There's so many different styles and facets of the 360-degree musical sphere to listen to. From tribal to classical music, it's all there. If the bottom was to sag out of that, for God's sake, help us all.