Storage medium, game apparatus, game system and game controlling method

An example game apparatus includes a CPU, and the CPU reproduces a BGM according to BGM data. When a ball object and an item object are shot at a predetermined timing, and a player object catches or receives the ball object at a point of impact, a part of melody of a main theme of the BGM is output. In a case that each player object catches or receives a ball object of the same color as that assigned to the own player object, a correct melody is output, but in a case that it catches or receives a ball object of a different color, a melody being different in pitch is output. Alternatively, in a case that the ball object cannot be caught or received, no melody is output.