I noticed things in my computer music that were getting old, and I started to figure out that this has to do with the way the listener interacts with music.

I think of myself as experimenting with different ways of structuring pieces. A lot of it has to do with the computer, of course.

With a piece of classical music by Haydn, Mozart, or Beethoven, on first listening I'm referencing it with other pieces by them that I know. I think that most people do this - they listen to pieces through the filter of pieces they already know.

I came to what I think of as the critical problem: the aging process of a piece of music. I noticed in the '70s that pieces I wrote would sound great the first time I listened to them and then on repeated hearings they sounded older and older until what seemed exciting and vibrant on first listening became stale.

Even today, I notice that some of my pieces are explicitly tonal; there are actually tonics and dominants. And then there are pieces that are not tonal. I tend to think that there's a dichotomy that has to do with the way pitches are structured.

It's always a thrill for me to see new versions of my pieces on YouTube.

There are, however, composers whose music can only be heard in a chromatic sense. George Perle, for example, wrote pieces that you might think of as leaning in a tonal direction but it's very hard to register a pitch as, say, the sixth degree of a scale, whereas in much of my music I think that's often relatively easy to do.