BGM Test option
At the title screen, press L1(3), R1(3), L2, R2. If you entered the code correctly, you will hear a sound. Choose the "Sound" selection at the options menu, then choose "BGM Test" to hear all the background music from the game. Press R1(2), R2(2), L1(2), L2(2) at the title screen in the Japanese version of the game.