A great thing, but made into a generic artform by every scene kid that whines about having no other way to express himself/herself. If you identify with music that's cool, but don't let if define you as a person. It's not the only thing out there, if it was, we'd all be screwed.
Me: Why do you listen to your iPod all the time?
Scene kid: Because music if my life force, and without it I'd have no other way to express myself and lose my identity as a human being.