An electronic music system includes a computer which performs a sequencing function and a remote controller. The remote controller is provided with a start operator and a selection operator. In response to an instruction made by the start operator of the remote controller, the computer or the remote controller adds a new track on a sequencer configured on the computer. The computer or the remote controller then offers options of available different types of tone generators used for the track, and in accordance with a selection made by the selection operator in a state where the available different types of tone generators have been offered, assigns the selected type of tone generator to the track.