PROBLEM TO BE SOLVED: To provide a musical sound creation device, a musical sound creation method, a musical sound creation program, and an electronic musical instrument that can more effectively shorten the time required for musical sound creation processing using a plurality of pieces of waveform data to achieve good musical performance.SOLUTION: A musical sound creation device comprises: a RAM 208 that is used by a sound source LSI 204 in generating musical sound; and a large capacity flash memory 212 that stores all waveform data used for tone colors. Waveform data having a data size exceeding a preset threshold is arranged in the RAM 208; each time for waveform data having a data size equal to or less than the threshold, when waveform data from which sound is generated is already present in the RAM 208, the waveform data is read and used for sound generation, and when the waveform data is not present in the RAM 208, the waveform data is transferred from the large capacity flash memory 212 to the RAM 208 and used for sound generation.SELECTED DRAWING: Figure 5
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