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. In transferring waveform data to be an object of a reading operation for sound generation from the large capacity flash memory 212 to the RAM 208, when the waveform data is already present in any one of waveform buffers in the RAM 208, the waveform buffer in which the waveform data is present is determined as a link destination, and the waveform data is diverted in the RAM 208, and thereby the waveform data is directly read by a waveform reading device included in a waveform generator of the sound source LSI 204 to generate sound.SELECTED DRAWING: Figure 2
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