My concern with this approach is that music becomes a substance devoid of people. It's a consumer model of what music is: subjects listening to objects. For me, music is subjects listening to subjects. It's about intersubjectivity.

When I give a concert, I know they're not going to hear everything; there might be a lot going on. My individual perceptual and cognitive path through the music is just that: one path through music. My experience will be probably at some level different from other people's, and that multiplicity of experience has to be supported by the music. I might just focus on the cowbell the whole time - maybe I have a fever for more cowbell!

In the 1990s I got to play in a group that played in prisons in California. We would play in maximum security wards. It was infuriating. Those kinds of situations stick with me. We got to come in and play music for them because that's a way of caring, just offering something, a gift, basically. They're basically the most grateful audiences I've ever experienced, because nobody's giving them anything.

The sense of having to be the best at everything gets in the way of anybody doing anything. I put all that aside; it's not worth thinking about when I'm there. My agenda as an artist doesn't go away when I teach. It actually gets intensified.

If we reject the word, or any word that labels music, what's left? That's the question we should all ask ourselves. Ben Ratliff asked it, and he came up with aesthetic categories. That's not what I would say. What's left are communities who make music together, or among whom music circulates. That's it.

You figure out how to create opportunities to make music, and then, if you take care of the music, audiences will come around. They also might leave. What matters is the moment: the moment of making music, with and for and among others, and what that offers to those people in that moment. They might never see me again; they might never learn my name. But it might still be something they carry with them.

The thing about physicists is that they tend to think that everything is physics. I don't. That's not what music is to me. You can explain aspects of it in physical terms, including the physics of anatomy: how our bodies move, the torsional moment of inertia, the way you move your body to a beat, the inherent periodicities of the heartbeat, the gait. That's physics, too, I guess - maybe they'd call it biophysics.