public IActionResult AddSong(Song s)
        {
            //TODO: Test this
            if (ModelState.IsValid)
            {
                var song = new Song
                {
                    Title = s.Title,
                    Url   = s.Url
                };
                repository.Update(song);

                return(RedirectToAction("AllSongs", "Music"));
            }
            else
            {
                return(View());
            }
        }