In no offline job I've ever worked on have staff been allowed to listen to music while they're working I don't see it as professional, I think in some jobs they may have background music while they're working, like in a kitchen or a clothing store, etc, but in most jobs that's just a distraction for the staff.
In online jobs logically there is no one to prevent you from working with background music, but I still think it is a distraction, I think that when you are working you have to be focused on what you are doing and not have noise or music playing.
In online jobs logically there is no one to prevent you from working with background music, but I still think it is a distraction, I think that when you are working you have to be focused on what you are doing and not have noise or music playing.