To the improvement of my focus and productivity I recently-ish got into listening "arbitrary" music with little to no lyrics and an uplifting tempo.
I used to listen to particular bands which I felt "defined my identity" or something, which I still occasionally do, but I've since realized that when I'm working it's "distracting" to me and I now listen to things like generic "trailer" / epic music or "upbeat" music for workouts.
This is pretty much what I end up doing by choice, but it only acts as an aid if I can also take them off and get a break. The problem is made worse when you can also see the person chewing with their mouth open and possibly being able to smell it.
Can't do it myself, but I've heard that people listen to typical traditional "video game music" for this purpose. Fast, upbeat, and never something you need to focus on, but rather, it just helps you keep up the concentration.
...if you're the type of person who can listen to music while working, that is.
To add to the other comment. Game music/soundtracks can be good for that, lots of options there, usually that music is to fill the background and keep someone engaged with the game. I also find LoFi music good for that purpose.
I actually had the Golden Axe theme[0] on repeat for 4 hours and didn't notice =) I also have a feeling it wasn't the full song, but I had clipped it to a shorter length to fit into the space required for a ringtone at the time.
I used to listen to particular bands which I felt "defined my identity" or something, which I still occasionally do, but I've since realized that when I'm working it's "distracting" to me and I now listen to things like generic "trailer" / epic music or "upbeat" music for workouts.