If you sit there and you know that rule #1 is just that everything you do is honest and is just a natural and instinctual extension of yourself, then there you go.

Parenting changes your life, it changes how you hear yourself in relationship to others - which is part of the reason that a bunch of people in the rock community are sick of the goodwill and positive energy and love between these 45-year-old musicians who they preferred when they were 25 and taking stabs at each other.

Back then, I was really into composing the entire solo, beginning to end. I wanted to have it at least 80 to 90 percent complete before going into the studio. I didn't improvise in the studio. I was young, and I didn't really have the development in my playing or the ability to show up with nothing and then put down 500 ideas. I can do that now because I'm so much more of a musician now.

Stretching your parameters is a necessity if you wan to keep growing, and sometimes the best way to do that is to dive into the deep end.

Metallica lives in a little bubble. We just do our own thing. We're not part of any trends or waves or fads. We can just do our own thing, all the time. It's a great luxury. I don't think we were really appreciative of it until recently, and really understood that it is what keeps us alive. It's great to be able to have the freedom to run around and do all this crazy stuff, and at all cost, avoid making another record, just to piss our managers off.

Sharing's only fun when it's not your stuff.

Hugh [Evans] called us. And obviously this has been on our radar for all the years it`s been going on. And each year obviously reaches more and more people, and it`s high profile. Hugh reached out to our manager just down the street. And we said we`re here [ on GLOBAL CITIZEN in the Central Park] to help and do whatever we can.