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.

I teach a graduate seminar called "Theorizing Improvisation" that is pretty interdisciplinary, but really makes students deal with black studies seriously. A lot of authors of color, a lot of women of color - those become central to the intellectual trajectory. It considers music, but it also considers areas of thought that might seem unrelated to music. That's partly because we're expanding the notion of what music is beyond objects, beyond scores, beyond things.

What we call music is what reminds us of ourselves. And sometimes electronic music helps lead the imagination to a space that seems outside of ourselves. But it never really is.

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.

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.

We think of music as this substance that flows - you turn on the tap, and there it is, streaming off your computer - but that's not how we evolved as a species. We evolved to listen to each other, and the reason we're able to listen to music in the terms is talking about is because we're really good at listening to each other. But this kind of technology has allowed us to forget that music is the sound of each other.

What I've learned from my gurus is that when you hear music, you hear a person, or you hear people, and you hear everything about them in those moments. They reveal themselves in ways that cannot be revealed any other way, and it contains historical truths because of that. To me, that is the most important thing. It shouldn't be a footnote, or the last chapter. It should be the complete thesis about a book on listening.