public ActionResult AddSingle()
        {
            AddSingleViewModel model = new AddSingleViewModel();
            model.BandName = Session["band"].ToString();

            return View(model);
        }
        public ActionResult AddSingle(AddSingleViewModel model)
        {
            if (ModelState.IsValid && !String.IsNullOrEmpty(model.SongName))
            {
                bandService.AddSingle(model);
            }

            return View(model);
        }