Music is a crucial part of my existence. I focus much better with any kind of good music, and it gets to the point where I have a few entire songs going through my head at any given moment when music is not playing and I can't help but tap them out as though on a piano. Which is not good for playing games, so clearly I need something to stop me from doing that, which is actual music. Also music does stuff to your subconscious that aids in focusing, particularly mine.