Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An essential part of the film's story line

Many consider Herrmann's musical contribution to the classic Hitchcock film to be the third "star" behind leads Stewart and Novak. Who am I to dispute that?Almost every scene is filled with the lush strings and ominous chord arrangements of which Herrmann is noted. Of course, the central theme is repeated or restructured but that only serves to support its importance.Herrmann knew how to musically tell a story. His passages reflect the on-screen action; they alternate from extremely subdued to blaringly threatening. Very few film composers had (or have) his knack for adding "color" to the filmed images."Vertigo" is one of Sir Alfred's most personal films, and the Herrmmann scores remains one of that musician's most dynamic undertakings.