Vocaloid is a singing voice synthesizer software developed by Yamaha Corporation, first released in 2004. It enables users to synthesize singing by typing in lyrics and melody. The ‘Vocaloid’ series has become a cultural phenomenon, spawning virtual idols like Hatsune Miku, and inspiring anime, concerts, and various media adaptations. While not strictly an anime series, Vocaloid has significantly impacted Japanese pop culture and music.