// POST api/Songs
        public HttpResponseMessage PostSong(Song song)
        {
            if (ModelState.IsValid)
            {
                db.Songs.Add(song);
                db.SaveChanges();

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, song);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = song.SongId }));
                return response;
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }
        }
        public static void AddSong(HttpClient client, Song song)
        {
            HttpResponseMessage response;
            if (client.DefaultRequestHeaders.Accept.Contains(new MediaTypeWithQualityHeaderValue("application/json")))
            {
                response = client.PostAsJsonAsync("api/songs", song).Result;
            }
            else
            {
                response = client.PostAsXmlAsync("api/songs", song).Result;
            }

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("Artist {0} added successfully", song.Title);
            }
            else
            {
                Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
            }
        }
        // PUT api/Songs/5
        public HttpResponseMessage PutSong(int id, Song song)
        {
            if (!ModelState.IsValid)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            if (id != song.SongId)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }

            db.Entry(song).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }