as a musical instrument. References: ^ "NEWS: ZERO-G announces first 3 Vocaloid titles" . http://www.zero-g.co.uk/index.cfm?articleid=803 . Retrieved on 2008-07-17. ^ "Vocaloid's English official website" . Yamaha . 2004-11-09. http://www.vocaloid.com/en/index.html . Retrieved on 2008-09-01. ^ "Crypton Future Media Vocaloid MEIKO" . http://www.kvraudio.com/get/1368.html . Retrieved on 2008-07-17. ^ "Crypton Vocaloid KAITO" (in Japanese).