Woodstock was both a peaceful protest and a global celebration.

I opened the Woodstock Festival even though I was supposed to be fifth. I said, 'What am I doing here? No, no, not me, not first!' I had to go on stage because there was no one else to go on first - the concert was already two-and-a-half hours late.

Music is the major form of communication. It's the commonest vibration, the people's news broadcast, especially for kids.

I started out by myself, but it eventually turned into a trio by the mid-'60s - a conga drum and another guitarist. And that's been mostly what I've worked with most of the time.

I haven't seen my face since I started growing my beard, which was when I was a teenager, almost; I never shaved. So I don't really know what I look like.