> The app does absolutely no work in the background. It works by simply existing as a running process, thanks to having the same bundle identifier as the Music app.

I love clever, low-or-no-code engineering solutions like this. You typically need to understand a systems very deeply to reach this level of elegance. In this case, one has to understand exactly what happens when the play button is pressed in Mac OS, how bundle identifiers work, etc. And the outcome is an app with almost no code at all – just a collision – it's beautiful.

(As an aside, coding agents are terrible at this kind of thing; I'd guess Codex as of right now would write some overpowered application that polls in a loop looking for Music App starts and killing them)