What is a musical manuscript also called?

a score.

A musical manuscript or score is a written or printed document used for composing, performing, or studying music. It usually includes instructions for the tempo, dynamics, and articulation of the music, as well as the notes, rhythms, and harmonies. The manuscript can be written by hand or printed by a music publishing company. Different types of scores exist, such as vocal scores containing only the vocal parts, or orchestral scores containing the parts for all instruments of an orchestra. The use of a score allows musicians to perform together and synchronously, as well as to analyze and understand the structure and composition of a musical piece.