I don't listen to music when I write, but I do turn on appropriate music when I read portions of my manuscripts back to myself - kind of like adding a soundtrack to help shape mood.
“But audio is a component of video, so there's always been that anyway, and although we've never expressed a visual side apart from the Grateful Dead movie, I don't find it that remote, you know what I mean? It's a departure of sorts, but it's like a first cousin.”