Creating Psychological Tension Through Sound Effects
Hitchcock established a method of increasing tension by contrasting silence with sudden noise. In Sabotage (1936), only the audience knows that a boy is carrying a time bomb. Repeated sounds of street clocks make the approaching deadline audible, while quiet everyday sounds as the boy takes detours or his bus stops at traffic lights heighten the sense of impatience.
The essence of this technique is that sound itself becomes a trigger for suspense. In The Man Who Knew Too Much (1956), the conspirators plan to fire a gun at the moment of a cymbal crash during an assassination at the Albert Hall. Early scenes repeatedly play a recording of that cymbal sound, imprinting it on the audience.
During the climactic concert, viewers' heartbeats rise as the music progresses toward the cymbal crash, and suspense peaks with the musical crescendo. By incorporating sounds within the story, including music, into the plot, this innovative direction made sound itself a trigger for suspense.
In Blackmail (1929), early in the sound-film era, he expressed a character's psychological anxiety by making only the word 'knife' stand out audibly, exploring sound technology's possibilities from an early stage. These techniques continue as fundamental approaches to sound direction in contemporary cinema.
The Golden Partnership with Bernard Herrmann
Collaboration with composer Bernard Herrmann is one of the most important elements in Hitchcock's film history. Their partnership spanned seven films, including The Wrong Man (1956), Vertigo (1958), North by Northwest (1959), and Psycho (1960), producing numerous masterpieces of film music.
Although a perfectionist, Hitchcock gave Herrmann considerable freedom over music, trusting that a composer who understood even a film's subtext, or underlying themes, would integrate the score with the images. The results include Vertigo's poignant love theme and the exuberant overture to North by Northwest.
For Psycho in particular, the low budget led to a reduced orchestra of strings alone, creating a 'black-and-white score.' According to an anecdote, Hitchcock initially intended to use no music in the shower murder scene but changed his mind after hearing Herrmann's proposed, now-famous anxiety-inducing string screeches.
The music consequently multiplied the horror of the images and set viewers' nerves on edge. Music in Hitchcock's films emphasizes the psychological effects of timbre and rhythm over melodic beauty, directly communicating tension and anxiety to audiences.
An Innovative Experiment in Removing Music
There were also bold experiments in deliberately excluding music. The Birds is the prime example: although Herrmann was credited as a sound consultant, no dramatic score was composed, and electronically generated bird calls carried the entire film. This paradoxically heightened its realism, while the lingering eeriness of dissonant electronic sounds stimulated the audience's imagination.
Instead of conventional orchestral music, The Birds created suspense in tense moments, such as the heroine waiting outside the school, through sound effects alone, including wingbeats and bird calls. Only the audience sees crows silently gathering one by one on the playground equipment behind her; when she turns, countless birds have assembled. Sound effects alone create this terror.
The contrast between silence and intense attack sounds was also innovative in generating fear. In scenes of panic as birds attack together, sudden silence contrasts with fierce attack sounds, heightening fear while leaving much to viewers' imaginations.
Hitchcock's direction calculated even when music should begin or stop, skillfully controlling the audience's anxiety and relief through sound. It was a groundbreaking experiment demonstrating that the absence of music could itself become a means of expression.
Perfecting Emotional Control Through Sound Design
In scenes featuring gramophone or piano music within films such as Born Yesterday (1950) and Rope, Hitchcock also incorporated it effectively to heighten suspense. In Rear Window, the neighboring composer's piano piece recurs, and changes in its mood at turning points convey characters' psychology and the passage of time.
The celebrated Hitchcock–Herrmann partnership ended abruptly over creative differences on Torn Curtain (1966). Hitchcock wanted more modern, brighter music and rejected Herrmann's score. Other composers provided the music for subsequent films, but its impact was diminished compared with Herrmann's classic scores.
In his later film Frenzy (1972), Hitchcock reinforced suspense through skillful dialogue and realistic sound effects more than music. Depicting a crime through silence outside a door, he activated viewers' auditory imagination. With a long take moving away from the murder scene, he perfected a technique for expressing terror through sound effects alone.
Overall, Hitchcock understood the power of sound cinema early and established methods of using sound design to control audiences' emotions at will. His skillful use of music, sound effects, and silence created psychological fear and tension that images alone could not convey. Ideas underlying contemporary cinematic sound techniques already appear in fully developed form in his work.
