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Who are you referring to?You haven't helped the user. It appears you are so bent on trying to defend the Android platform that you're making excuses and not listening to what his problem is. I find that very unhelpful and quite unprofessional.
An additional point: your answer seems to suggest that this behavior is normal.
However, if one opens the very popular Tidal music player app and he closes that app (from the recently used app interface), the music stops immediately.
This is not just a logical, common sense behavior, it is a behavior I would expect as someone who has been using Android since 2012.
I ask you which is the most logical behavior:
A sound producing app that stops making sound when you explicitly close it?
Or an OS that allows an app to 'disappear' from the phone and its app queue -- while still making sound whose source can not be readily identified?
I suggest you check your attitude, and check your professionalism. And maybe take a class in UI design.
Not just that if you have premium service on these music apps they allow to play in the background until you press stopJust a thought, it's very possible the OP was asking about unwanted music playing in the background due to some kind of adware, rather than music that was intentionally played from a music app.
Sometimes it's Google fault other times it's the Manufacturer that put their flare on Android also , it gets frustrating but we try for the best we can in search of a solution or workaround.Thanks for your response. Sorry about my tone, but after a decade of using the platform, I have precious little patience for the absolute mess Google has made of Android 'support.' That said, i certainly realize that that mess is not your fault. My bad.