A music playback device applicable to a portable telephone terminal device
uses a sequence data FIFO memory and a waveform data FIFO memory both
having limited storage capacities. A system CPU performs successive
transfer of sequence data and waveform data in response to shortage
events of the memories. Hence, it is possible to actualize high-quality
playback of musical tunes with small storage capacities of the memories
and with small load of processing of the system CPU.