I’m an advocate of background noise while I work.
I have a short attention span outside of gaming and having two things happening at once helps me concentrate. Music is good and films/tv series that I know off by heart tend to be the best things for me. It needs to be something I know though.
At university I found that the best music for studying was prog rock. Lots of interestingly dense musical experiences intertwined with philosophical musings (I have a Masters in Philosophy) really helped me when it can to essay time. The bands that helped me the most were Tool and Pink Floyd.
I need to make the music more of a habit again because despite my deep focus on games I still get distracted.