A non-transitory computer readable medium storing an accompaniment sound generating program, the accompaniment sound generation program causing a computer to execute a processes of:
- specifying a plurality of musical performance parts for which accompaniment sounds are generated based on at least one input musical performance sound;
- generating the accompaniment sounds that belong to the plurality of specified musical performance parts for each input musical performance sound;
- and
- outputting the accompaniment sounds generated for the plurality of musical performance parts with timing for generating the accompaniment sounds aligned with timing for generating the input musical performance sounds to a tone generator, wherein,
- the tone generator reproduces the accompaniment sounds via a sound system.