Karaoke is a form of entertainment that enables people to become vocal stars by singing along with specially produced accompanying music. In conventional karaoke, lyrics are displayed on a television screen to help the singer follow the words. Our extended karaoke system is based on virtual reality technology. There are two motivations for this endeavor:Firstly, Virtual Stage is a complex multimedia system that demands advanced technologies in various fields: multimedia, virtual reality, and artificial intelligence. We would like to extend the karaoke system to embrace 3D real-time graphics and animation technology, 3D interaction technology, intelligent scoring of human performance, and virtual agent technology for intelligent behavior.