I would definitely ask politely for the music to be turned right down and if it was really annoying I would ask for the "noise" to be turned off. Or alternatively I would ask for another table where this racket was not audible. As I am a singer and music is an important part in my life, I definitely do not need to hear endless music not to my taste, when I am out to lunch. For me it is at least eating in a work atmosphere, and worse cringing when it is appalling stuff and you can hear horrible cracks and hisses etc.After all I am paying for this, so that at the least we should be able to eat without any music. If they turn it down and try to be helpful I may come back but otherwise not only will I not return but would also warn all my musical friends to avoid it too!