I can communicate far better on a guitar than I can through my mouth.

I can only listen to what I'm working on, at the time. I can't listen to anything else because I don't want to copy it.

We kept moving forward and didn't try to recreate the past .. the approach to each album was radically different every time. Many bands would have some success and, because they were locked into having a single - something we didn't have to worry about - they had to make sure there was something similar on the next album ... that was never the idea with Led Zeppelin .. the goal was to keep that spark of spontaneity at all times.

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 think it's time to travel, start gathering some real right-in-there experiences with street musicians around the world.

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.

Artists say that paintings are never done. I sort of feel the same way about music. I would never say something is perfect. There are performances that can generate a lot of emotion in me when I hear them, but I can't say if anything is perfect.