changers, i think, for all of the musicians who took in the '88 tour, we had springsteen, doors, tracy chapman and i think for all of us, it was unlike any other experiences we had had. >> what's your sense of artists and musicians getting involved in causing like this? to feel good that you can change something? or do you think it really influences change? >> i don't think, you know, that the popular conception is we just do it to pop ourselves up and assuage our guilt, but i don't think it is like that. i don't think any of us would waste the time to do it if we didn't think it was going to make a difference. with the amnesty tour, for instance, the membership was doubled worldwide. music, yes . >> actually, as you guys know, you've got to film it in the right way. you've got to make it edited in such a way that it delivers the content in a meaningful and powerful and short enough, concise enough form that it actually makes a difference, touches people, and then, as i was learning even yesterday from -- because there has been a seismic shift. our dream is to get cameras to the world. we coul