If you don't have music, you have silence. There is power in both.

The point of nonviolence is to build a floor, a strong new floor, beneath which we can no longer sink. A platform which stands a few feet above napalm, torture, exploitation, poison gas, A and H bombs, the works. Give man a decent place to stand.

And my voice now is a struggle, it's a daily struggle to keep it up. Gravity has begun to fight the vocal cords the way it does with everybody. So I have a vocal therapist, and we record the sessions and I use them on tour every day.

I think I would have had an easier time of it if I had had training much earlier. Because when I got to the training, it was in my late 30s and I already probably had every bad habit a singer could have. In fact, it still goes on. It's un-training those habits and retraining new ones - the breathing, the relaxation, the tongue, the lungs, the everything.

I'm lucky to have met so many people who have been involved in peace and who have been peace prize winners.

Peace might sell, but who's buying?

I wasn't popular in school, I was Mexican, I was all these inappropriate things. I started playing the ukulele and taking it to school, and I realized people liked listening to it. I would play it to comfort myself at home, and I'd play rhythm and blues songs that had four chords. That's how it started.