Music on the jobsite should revolve around some respect and courtesy. It does seem a lot of people are unaware of their surroundings. New construction jobsites are probably the most forgiving. I never understood the lack of appreciation some crews have for an established residential neighborhood and how loud music might affect potential customer's (neighbors) reaction. As is obvious in the responses to this thread, some people just don't like it. If the music can be clearly heard by the next door neighbor, it's too loud......especially when certain kinds of music already have a limited audience.
I do play music though a bluetooth speaker quite often. I am completely (well mostly anyway) aware of my surroundings and adjust volume accordingly.