How does acting differ from music-making for you?

I think actors are at the mercy of the opportunities presented to them. So you kind of have to wait for them to choose you. My music is insular - I can choose that. I was very fortunate in having David [Fincher, the director] come to me. Now I've seen the finished product, I feel that every bit of the nine months we spent on the film was worth it.

What shades of evil do you see you and your accomplices in?

Bad, evil or good was never discussed in rehearsals with David. He didn't say, "You're the good guy," or whatever. When I saw the finished movie, I realised there was a crystallising moment when these three individuals become individual personality traits that morph together into one. If that's the case, then Forest Whitaker plays the emotional self, in a Freudian way. Jared's character, Junior, is the ego-based self. Raoul, mine, is the logic-based self - pure and emotionless.

Was it a particularly dark shoot to work on?

The process of this film was unique. It wasn't dark so much, but arduous. We started with one group of cast members - with Nicole Kidman, who damaged her knee on "Moulin Rouge". When Jodie became available, it was in a serendipitous way, as it turns out that, ironically, Russell Crowe had injured himself in rehearsals for "Flora Plum", the film she was going to direct. So she was available. We started shooting, and then Jodie found out she was pregnant. Forest broke it to me - he'd gone to work and heard it on the radio! It seemed like the movie was doomed. But, like these characters, there was a disregard for all the signs along the way.

The BBC is not responsible for the content of external websites.