I go for thrash metal, with earplugs then over the ear headphones turned up enough to get through the earplugs at a comfortable volume. That blocks any exterior

I go for thrash metal, with earplugs then over the ear headphones turned up enough to get through the earplugs at a comfortable volume. That blocks any exterior sound, is complex enough that I don't get bored, but doesn't have anything hook-y enough that it pulls my attention away from the task.