I think the difference between music and background music makes sense here. I use this this kind of background music as a way to drown other noises, because it

I think the difference between music and background music makes sense here. I use this this kind of background music as a way to drown other noises, because it's easily canceled by the brain. It's basically a nicer white noise, better than silence because it allows me to ignore much better the noises around. So for the 'need' for audible stimulation, it's actually the opposite : you cancel as much as possible the stimulation by having a constant and easily filterable input that drowns the unexpected noises that could be stimulating/break your focus