There is provided an electronic musical apparatus that is capable of providing listenable performance by using data reflecting the intention of the user among usable data, as well as a program for electronic music. A tone generator device is capable of sounding musical tones based on data representing preset musical tone control information or user musical tone control information. When data representing musical tone control information that is inputted is data representing user musical tone control information incapable of being sounded by a tone generator circuit and the data representing the user musical tone control information includes data representing original preset musical tone control information as a basis of the user musical tone control information, a CPU sends the data representing the original preset musical tone control information as an alternative to the data representing the user musical tone control information to the tone generator circuit and causes the tone generator circuit to sound musical tones based on the original preset musical tone control information.