TLDR it feels better to announce yourself with some (non aggressive) music than triggering a bell.

I wouldn't use that when hiking but it is true that I sometimes use a bluetooth speaker when riding my bicycle in the city.

I don't put it at full volume but a lot of pedestrians and their dog seem to be attracted by dedicated bicycle lanes when they are built on the same level as the sidewalk. It is a good way to warn people of my presence without using a bell. Using a bell sometimes sounds a bit rude because people associate it to the use of the car horn which has become a proxy for insults instead of the warning device it used to be.

[1] I used to think pedestrians were doing it to annoy cyclists on purpose but judging by their often suprised reaction. I think it is just an unconscious behavior. Apart from bicycle lanes which aren't well marked, it is probably because the bicycle lanes are usually a smoother surface and thus more agreeable to the feet than the sidewalk thus people tend to walk on them natually.