Instructions
Look in the corner behind the soda machine in the lobby to find the first meteorite. The lobby is the room in which you start. Center it in your viewing reticule and then hold the "Square" button until your character comments on it.
Proceed north until you reach the stage, and then veer right to enter the dressing room. Here, you'll find the second meteorite on a pedestal. Hold the "Square" button until your character comments on it, too.
Return to the stage and take the stairs to enter the basement. You'll find the final meteorite on a cabinet next to some marquee letters. Activate it and "115" will start playing.