Hatsune Miku
, sometimes referred to as Miku Hatsune, is the name of a Vocaloid software voicebank developed by Crypton Future Media and its official moe anthropomorph, a 16-year-old girl with long, turquoise twintails. She uses Yamaha Corporation's Vocaloid 2, Vocaloid 3, and Vocaloid 4 singing synthesizing technologies. She also uses Crypton Future Media's Piapro Studio, a singing synthesizer VSTi Plugin. She was the second Vocaloid sold using the Vocaloid 2 engine and the first Japanese Vocaloid to use the Japanese version of the Vocaloid 2 engine. Her voice is modeled from Japanese voice actress Saki Fujita. Miku's personification has been marketed as a virtual idol and has performed at concerts onstage as an animated projection (rear cast projection on a specially coated glass screen).
Ievan Polkka
The Finnish folk song was also given popular covers by several Japanese Vocaloid singers, such as Megurine Luka, Kagamine Rin, and Kagamine Len. The most popular vocaloid cover belonged to that of Hatsune Miku, garnering more than 40 million views on her official YouTube music video as of December 2017. Its popularity has lent itself to being used in the Vocaloid rhythm game "" as the tutorial music. It has also been used in a commercial promoting the LG G5 smartphone.