A game recording medium allows a player to enjoy a game without damaging a feeling as if the player played a musical instrument or conducted an orchestra even when the player cannot perform an operation input matched with an indication sign. Time is counted with a start of playing a piece of music and an indication sign is displayed on a time axis. When the indication sign reaches a criterion line, a sensed input operation is analyzed. The analysis result is determined on the basis of a criterion value corresponding to the indication sign. When it is determined a proper operation is not performed, music change information is specified on the basis of the analysis result and the criterion value, and a pitch, a tempo, and the like of the music data are controlled on the basis of the specified change information.