Not sure if anyone knows about this.....if you do than your awsome too! On single player practice, or 2 player mode, if you go to the level select, and pick an old school level, and press start on the correct level (Goro's Lair, Dead Pool, Liv. Forest etc.) you will hear Shao Kahn laugh. If you hear this, select each of your fighters with the start button as well(and their costumes). Then when the match starts you will notice that these certain levels will have their original background music!!! This is so Kool!!! It just brings back that MK nostalga even more!! enjoy.