Compositional method, compositional program product and compositional system

A compositional system, comprising:

• an electronic device having a pitch input interface, a beat input interface, a memory, a display unit and a processor, with the memory storing a pitch input procedure and a beat input procedure executable by the processor;
• the pitch input procedure for allowing a user to sequentially enter a plurality of pitch marks through the pitch input interface, with the pitch narks being displayed on the display unit sequentially and carrying pitch information;
• and
• the beat input procedure for providing a hint signal at each beat in accordance with a predetermined tempo (beat number/minute, BPM, beats per minute) to give a hint to the user so that in a hint state the user sequentially inputs a plurality of action signals in accordance with a rhythm through the beat input interface, with the action signals corresponding to the pitch marks, respectively, wherein points in time corresponding to the action signals are sequentially regarded as points in time of the pitch marks, and the pitch marks which the points in time are allocated to are sequentially defined as a plurality of completed notes and sequentially displayed on the display unit, wherein the completed notes not only carry pitch information but also carry duration information because of their points in time,
• wherein the pitch marks and the completed notes are stored in the memory.