Hatsune Miku is a software of vocal composition by Yamaha. The software is called “Vocaloid”, so everyone can compose with Vocaloid. That is to say, everyone who have Vocaloid can make song without singer. Almost Vocaloid user contribute music to Niconico animated web site. Vocaloid has a lot of kinds of virtual singer. For example, Hatsune Miku, Rin Kagamine, Len Kagamine, Kaito, Meiko, Luka Megurine and so on. Setting vary all the way from about ten years old to about fifty years old. Vocaloid celebrated 10th anniversary. This is a so popular in the world.