Is John Cage fine?
Doesn't get much quieter than that.
I picture this being said sarcastically by an irritated neighbour.
Or in a restaurant!
"Do you have A quiet music" is not English, whereas the good English "SOME quiet music" is not accepted. Reported 14.1.16
As of March 1, 2016, it still asks for "a quiet music." Reporting this again.
"Quiet music" ? That's a concept...
"Sorry, Do you have quiet music?" is wrong. I used sorry as im more used to that term in russian