Some improvements...

Vocaluxe/Base/CBackgroundMusic.cs

@@ -333,6 +333,12 @@ namespace Vocaluxe.Base
             Play();
         }
 
+        public static void StopPreview()
+        {
+            _PreviewPlayer.Close();
+            _PlaysPreview = false;
+        }
+
         /// <summary>
         ///     (Re-)Starts the _CurrentPlaylistElement
         /// </summary>

Vocaluxe/Base/CMain.cs

@@ -395,6 +395,11 @@ namespace Vocaluxe.Base
             CBackgroundMusic.PlayPreview(start);
         }
 
+        public void StopPreview()
+        {
+            CBackgroundMusic.StopPreview();
+        }
+
         public CTexture GetVideoTexture()
         {
             return CBackgroundMusic.GetVideoTexture();