Abstract: In a game system, performance data which stipulates sequences of manipulations and allocation of sound effects for the manipulations can be set practically. The game system has memory device which stores performance data stipulating manipulations of a controller provided in correspondence with a predetermined musical piece; the performance data comprises information specifying a manipulation timing relating to at least one timing manipulation member provided on the controller, and information specifying which one of a plurality of selection manipulation members provided on the controller is to be manipulated in correspondence with the manipulation of the timing manipulation member; either one of the information specifying the manipulation timing included in the performance data and the information specifying the selection manipulation member can be edited independently of the other based on a command supplied via the controller by a player.