I’m preparing to settle down with my WIP now after doing some pre-writing, and I’m plugging into some music to help me focus.
Regardless of what I’m writing, I choose (without exception) music without lyrics. The latter are too distracting for me. Unless we’re talking opera or something, in which case they’re not a problem.
So, for me, it’s usually a film score (as long as I don’t know it too well and it doesn’t trigger me to remember specific film scenes or moments because those will distract me as well) or some kind of classical music.