That's the sound design. I watched it sixty times because we were constantly tweaking. The same thing comes twice, right? Once it comes in the beginning when he's about to discover that he needs to come out and one is the dream where he's flattered (??) and then he comes out. The last one, instead of going bigger, we made it smaller. We removed elements and thinned it out. So it doesn't drive him. He drives the music rather than the other way around.

I played a couple of ideas and then had this unusual texture underneath which was like this little granulated kind of pipe organ almost like a scratchy record which he started [inaudible] brilliantly. "Oh I love that song." And when things go fine, it's good. So he started loving that song and that song was used quite a lot in the movie which is very granulated stuff on the guitar.

How we approached this was I wanted this to be personal in a way. It's not a big, epic Hollywood score but really personal and intimate, and we thought guitar would be the perfect instrument for him because he's young and he has an undying spirit and all that stuff and we went on that feeling totally.

I've been doing music for many years and after a point what is the motivation that drives you to compose and to do stuff? I did this song for the U.N., a fighting for poverty anthem. That's when I realized that I could do a foundation. And when I started the foundation, it was basically to fight poverty and to help - that kind of stuff.

After a point of time, when you get success and fame, money and everything, the purpose of life has to be redefined. For me, I think that purpose is to build bridges. Artists can do that very easily, more than politicians.

It's a very simple process. He [Danny Boyl] comes in the tube (subway) and then he sits with me for 3 hours every evening and then I work on something. Then later, if he likes something, I put it even more perfectly. I tweak stuff. So this happened for 3 or 4 weeks and the music was done.

I've never watched Trainspotting. I just know it's a very critically acclaimed film. In fact, I've never watched any of Danny's movies [means before he met him]. I just worked with him and felt the energy of what he is about initially before I do something. In a way, I think that's why we have discovered each other rather than replicate something else.