Electronic musical instrument exhibiting randomness in tone elements

The electronic musical instrument is provided with a musical tone signal generating unit for generating a musical tone signal having a tone pitch corresponding to a depressed key, a self-running counter for counting a multibit digital quantity, a latch circuit for latching the output of the counter when supplied with a pulse signal representing the depression of a key, and modifying means responsive to the output of the latch circuit for modifying the musical tone elements, that is the pitch, color and volume of the musical tone signal generated by the musical tone signal generating unit.