public IActionResult List()
        {
            //load all available musics
            var availableMusics = _musicRepository.FindWithAuthor(x => x.BorrowerID == 0);

            // check collection
            if (availableMusics.Count() == 0)
            {
                return(View("Empty"));
            }
            else
            {
                return(View(availableMusics));
            }
        }