The seven white notes on the piano - each section of the piece (there are 12 sections) is five of those seven white notes. If you calculate it, there are 21 groups of five notes in any group of seven notes. And although there are 12 sections, this piece actually uses nine of those groups because some of the sections repeat earlier ones. So that's the formula. It's very simple as a way of generating something. It's my inner minimalist.

The thing that obsesses me more than anything is waste - the waste of human intelligence and creativity.

Of course, like anybody I repeat myself endlessly, but I don't know that I'm doing it, usually.

When you sing with a group of people, you learn how to subsume yourself into a group consciousness because a capella singing is all about the immersion of the self into the community. That's one of the great feelings - to stop being me for a little while and to become us. That way lies empathy, the great social virtue.

Admirers can be a tremendous force for conservatism.

You can hear the profile of a sound, in retrospect, so much more clearly than you did at the time. And I think one of the things that's going to be nauseatingly characteristic about so much music of now is its glossy production values and its griddedness, the tightness of the way everything is locked together.

I'm bloody awful at multi-tasking.