music_manager={}
add(modules,music_manager)
function music_manager:init()
 self._allow=true
end
function music_manager:allow(a)
 self._allow=a
end
function music_manager:update()
 if (not self._allow) music(-1,0) return
 local is_playing = stat(54) != -1
 local should_be_playing = completion_tracker:get_music_preference()
 if (is_playing and not should_be_playing) music(-1,500)
 if (not is_playing and should_be_playing) music(0)

 local label,pref="start music",true
 if (should_be_playing) label,pref="stop music",false
 menuitem(1,label,function() completion_tracker:set_music_preference(pref) end)
end