VOCALOID is a technology and application software developed by Yamaha that enables users to synthesize authentic-sounding singing by just typing in lyrics and melody.

Yamaha announced its development in 2003, launtched VOCALOID in 2004 and VOCALOID2 in 2007.

So far, Prima have been released from Zero-G Limited, UK, while Sweet-ann have been released from Power FX Systems AB, Swedish.