Provided is a program for musical performance which causes a computer of a musical performance apparatus to function as a posture variation acquisition unit 101 for acquiring the posture variation of a controller 5 per frame based on the angular velocity with respect to the posture or movement of the controller 5, a volume parameter setting unit 102 for setting a volume parameter for deciding the volume according to the posture variation, and a sound signal output unit 106 for outputting a sound signal of the volume according to the volume parameter.