Vocaloid's singing synthesis [ja] technology is generally categorized into the concatenative synthesis in the frequency domain, which splices and processes the vocal fragments extracted from human singing

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Vocaloid
Yamaha started development of Vocaloid in March 2000 and announced it for the first time at the German fair Musikmesse on March 5–9, 2003. It was created under the name "Daisy", in reference to the song "Daisy Bell",

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Software
Vocaloid-flex Yamaha developed Vocaloid-flex, a singing software application based on the Vocaloid engine, which contains a speech synthesizer. According to the official announcement, users can edit its phonological system more

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The software became very popular in Japan upon the release of Crypton Future Media's Hatsune Miku Vocaloid 2 software and her success has led to the popularity of the Vocaloid software in general. Japanese video sharing website Niconicoplayed a fundamental role

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For illustrations of the characters, Crypton Future Media licensed "original illustrations of Hatsune Miku, Kagamine Rin, Kagamine Len,

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Despite the success of the software in Japan, overseas customers have been largely reluctant to embrace it. When interviewed by the

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Though developed by Yamaha, the marketing of each Vocaloid is left to the respective studios. Yamaha themselves do maintain a degree of promotional efforts in the actual Vocaloid software, as seen when the humanoid robot model HRP-4C of the

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