An actor’s performance is guided by a script, which is a written account of her part in the play. Similarly, a musician’s performance is guided by the score, which is the written music she follow when playing a piece.
Mural: like a wall
Score: an amount or sum due; account; debt
Brief: short in length
Textbook: a book giving instructions in the
principles of a subject of study,
specif. one used as the basis or
partial basis of a course of study