In Versus mode, press 'Start when selecting a stage. Shao Kahn laugh. That stage's music will be replaced with a song from a previous Mortal Kombat title. Note: The following stages do not have an alternate soundtrack: The Courtyard (Night), Desert, The Flesh Pits, Hell, Rooftop (Dusk), Shao Kahn's Throne Room, Shang Tsung's Gardens, Shang Tsung's Gardens (Night), and The Bell Tower.