I had a guitar when I was 6 or 7, a plastic guitar with the Beatles' faces on it. It would be a collector's item now. It would fetch a hefty sum, I imagine.

The script is your map of the world, isn't it? And if someone knows that if it's well-written, you get all of the beats, it will tell you everything you need to know.

Being an actor is a good way to earn a living. And to meet fabulous people. It's great to live very comfortably. I've been lucky, I've had a lot of fun with great roles, but it is true that if I were extremely rich, I would stop and I would go to play football on a beach in the Caribbean with my children.

It's always hard when you're playing someone for a lot of people out there who are going to see the movie after reading the books. There's a communion between a reader and the writer, so people will have an idea who Sirius Black is and I might not be everyone's idea of that.

I still don't have a publicist. If I'm in a film, you have an obligation to promote it, I'll do as much as I can.

It's funny: I'm a lifelong musician, but because I principally play the piano it's been a solitary thing.

You take what you know, and you put it through your own prism. If I play characters that break down or cry, it's Gary Oldman crying; it's not the character crying.