A music apparatus has a data storage, a controller and a sound generator
for reproducing a music sound and a voice sound. The data storage stores
a music data file containing a music part and a voice part, the music
part containing a sequence of music generation events effective to
instruct generation of the music sound, the voice part containing voice
reproduction sequence data composed of a combination of voice
reproduction event data and duration data, the voice reproduction event
data instructing reproduction of a sequence of voice events, the duration
data specifying a timing of effecting a voice event in terms of a
duration time measured from another voice event preceding to the voice
event. The controller reads out the music data file from the data
storage. The sound generator operates based on the music part contained
in the read music data file for generating the music sound representative
of the sequence of the music events, and operates based on the voice part
contained in the read music data file for generating the voice sound
representative of the sequence of the vice events, thereby mixing and
outputting the music sound and the voice sound.