Lily is a Japanese VOCALOID developed and distributed by Internet Co., Ltd., done in collaboration with Avex Management Co., Ltd and YAMAHA Corporation, and was initially released in August 2010 for the VOCALOID2 engine. There has since been a second installment developed for the VOCALOID3 engine and dubbed V3 Lily. Her voice is provided by the Japanese female singer, musician and performance artist, Yuri Masuda. (Source: Vocaloid Wiki)
Vocaloid
