Method for musical composition, musical composition program product and musical composition system

A musical composition system, comprising an electronic device with a pitch input interface, a beat input interface, a memory, a display device, and a processor;

• wherein said memory contains a pitch input program and a beat input program for execution by said processor, said pitch input program, through said pitch input interface, allows the user to input a plurality of pitch symbols that shown on said display device in a proper order, each said pitch symbol is composed of its respective pitch information;
• said beat input program, based on predetermined tempo (BPM-beats per minute), provides the user a prompt signal at the time point of each beat, said prompt signals assist the user during the process of inputting a plurality of action signals to record the desired rhythm, each said action signal is matched to a said pitch symbol in terms of time point, the time points of said action signals are assigned as the time points for the corresponding said pitch symbols;
• after assigning time points to said pitch symbols, they are regarded as completed notes and are shown on said display device;
• in addition to pitch information, said completed notes also contain duration information from having time points, said pitch symbols and said completed notes are stored in said memory.