Almost the moment he died, they put him in Playboy as one of the greatest drummers, which he was - there's no doubt about it. There's never been anybody since. He's one of the greatest drummers that ever lived.

The element of change has been the thing, really. We put out the first one, then the second... then a third LP totally different from them. It's the reason we were able to keep it together.

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.

But to put out a greatest hits on one CD was totally impossible, I just couldn't do it. The best compromise was to put out two CDs - Early Days - which is what it is - and Latter Days.

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.

A lot of people can't be on their own. They get frightened. Isolation doesn't bother me at all. It gives me a sense of security.

Every musician wants to do something which will hold up for a long time, and I guess we did it with 'Stairway to Heaven.'