Bono, lead singer of U2 and a political activist, on why singing makes people vulnerable to change, to Time magazine:
"When you sing, you make people vulnerable to change in their lives. You make yourself vulnerable to change in your life. But in the end, you've got to become the change you want to see in the world.
"I'm actually not a very good example of that--I'm too selfish, and the right to be ridiculous is something I hold too dear--but still, I know it's true."