Vocaloid is a singing synthesizer application developed by the Yamaha Corporation that enables users to synthesize singing by typing in lyrics and melody. It utilizes Yamaha's Vocaloid synthesizing technology with specially recorded vocals of voice actors or singers. Using Yamaha's Vocaloid 2 technology and voice samples of Japanese voice actress Saki Fujita, the program allows the user to synthesize and optimize the singer's voice in harmony.