Apparatus for automatically composing music piece

An apparatus for automatically composing a music piece is provided by comprising a memory preliminarily storing plural kinds of pitch data. From this memory, at-random extraction is made of those pitch data agreeing with predetermined music conditions, and they are timewisely successively delivered out to be imparted durations, respectively, to form a composition data consisting of plural sets of pitch data and duration data amounting two to four measures to make a music piece. This composition data may be used for generation of music sounds, and/or display of music score image on a screen of a CRT device, and/or printing-out of a score by a printer, to be utilized in the sound-dictation training and/or performance exercise in providing, for example, musical education.