Piano-vocal score

A vocal score or piano-vocal score is a music score of an opera, or a vocal or choral composition written for orchestral accompaniment, such as an oratorio or cantata. In a piano-vocal score, the vocal parts are written out in full, but the accompaniment is reduced and adapted for keyboard (usually piano). The music is usually reduced to two staves; however, more staves, a second keyboardist (piano-four-hands), or a second keyboard part can be added, as needed.