PERFORMANCE SYSTEM AND COMPUTER PROGRAM

PROBLEM TO BE SOLVED: To provide a performance system that allows easier visual comprehension and easier operation even for those less skilled in playing musical instruments.SOLUTION: A performance system includes mode selection means 110, 120, 130-1 through 130-N for selecting a performance mode, and input means including: abstract musical tone input means 150-1 through 150-Q for inputting an input musical tone being one unit or a sequence of abstract musical tones; abstract chord input means 180-1 through 180-R for inputting an input chord being one unit or a sequence of abstract chords; performance signal input means 160 for inputting the input musical tone or input chord through receiving a performance signal from an external device. Further, the performance system includes performance control means that converts the inputted input musical tone and input chord, in accordance with a corresponding function previously set to the performance mode, to an output musical tone being at least one unit or a sequence of concrete musical tones to be audio-outputted to outside so as to generate and output a performance signal indicating the converted output musical tone.