There is no way I would play guitar like a tour de force like I did in Led Zeppelin. John Bonham, phenomenal drummer, young man with his technique, but do you think he would ever have the opportunity to play like that in another band? Of course he hadn't.

All my houses are isolated. Many is the time I just stay home alone.

I remember one particular occasion when I hadn't played a solo for, quite literally, a couple of months. And I was asked to play a solo on a rock & roll thing. I played it and felt that what I'd done was absolute crap. I was so disgusted with myself that I made my mind up that I had to get out of it. It was messing me right up.

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.

So many people are frightened to take a chance in life and there's so many chances you have to take.

I think it was that we were really seasoned musicians. We had serious roots that spanned different cultures, obviously the blues.

Music can always be a life-changing experience, for musicians and fans, or at least life-affecting, but it depends on to what degree.