When I hang out with writers or editors, conversation inevitably touches on working with music in the background. There are always listeners and nonlisteners, but the most passionate are those who never work while listening. I think I understand—they read and write “by ear,” so their “music” is on the page; additional music clashes and distracts. Those who work more visually, on the other hand, can afford to add a music track. They might listen or not; it’s optional.