I recently moved away from music to using brown noise and it has proven far more effective at helping me stay in a focused state. But one trick I learned back

I recently moved away from music to using brown noise and it has proven far more effective at helping me stay in a focused state. But one trick I learned back in my college days that worked well was to play a single song on loop. It doesn’t really matter what the song is, though ideally it is something you enjoy (though not one of your favorites as you don’t want to wear yourself out on it). After a loop or two your brain gets used to it and it goes in the background and you stop noticing it.