| http://www.w3.org/ns/prov#value | - eproduction of MIDI data of the theme musical piece. musical piece data used in the system 100 is formed in the same data format as that of conventional MIDI data, and comprised of part data items for respective musical instrument parts (in the illustrated example, three parts, i.e. a piano part, a bass part and a drum part). [0104] In the illustrated example, the user plays the piano part, and he
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