How does sound work on an audience often without their noticing, and what do music, effects, silence and the source of sound contribute to a production?
Explain how sound design and music create meaning and atmosphere, including diegetic and non-diegetic sound, effects, music, silence and live versus recorded sound
A focused answer to the H2 Theatre Studies outcome on sound design. The functions of sound, diegetic versus non-diegetic sound, sound effects and underscoring, the power of silence, live versus recorded sound, and how sound shapes atmosphere, meaning and an audience's emotion.
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What this dot point is asking
SEAB wants you to explain how sound design and music create meaning and atmosphere: the functions of sound, the distinction between diegetic and non-diegetic sound, the use of sound effects, music and underscoring, the power of silence, and live versus recorded sound, and to apply this to a production. You should be able to read and justify sound as a deliberate, meaning-bearing element. The central insight is that sound is one of the most emotionally powerful tools in theatre and often works on the audience beneath conscious awareness, so a designer uses music, effects, silence and the source of sound to build atmosphere, shape feeling and carry meaning.
The answer
The functions of sound
Sound in the theatre does several jobs: it establishes location and time (birdsong for morning, traffic for a city), builds atmosphere and mood, signals or intensifies emotion, drives action (a phone that must be answered, a gunshot), and can comment on or counterpoint what is seen. Because hearing is closely tied to feeling and is hard to "switch off", sound frequently shapes the audience's emotional state without their conscious notice, which is part of its distinctive power.
Diegetic and non-diegetic sound
A key distinction is between sound that exists within the world of the play and sound that exists only for the audience. Diegetic sound is heard by the characters, a doorbell, an on-stage radio, an offstage crowd, and it grounds and drives the world of the play. Non-diegetic sound is heard only by the audience and not by the characters, such as underscoring music or an abstract atmospheric drone; it shapes the audience's response from outside the story. Recognising which kind of sound is in use clarifies what it is doing and to whom it is addressed.
Music, effects and underscoring
Music is hugely versatile: it can set period and place, signal or amplify emotion, accompany action, or, as in Brechtian theatre, interrupt and comment on the action rather than support it. Underscoring (music played beneath dialogue or action) subtly steers feeling. Sound effects build a believable world or deliver a shock, and abstract or distorted sound can externalise psychological states or create unease. The designer chooses whether sound should reinforce the visible action or work against it for ironic or critical effect.
Silence, and live versus recorded sound
Silence is itself a powerful sound: a sudden cut to total silence can be more arresting than any noise, focusing attention and heightening tension, and the contrast between sound and silence shapes rhythm. The source of sound also matters: live sound (a musician on stage, a sound made in the moment, an actor's unamplified voice) carries immediacy and connects to the liveness of theatre, while recorded sound offers precision, scale and effects impossible to make live. Reading sound design means attending to all of these, including what is deliberately not heard.
Examples in context
Example 1. Brechtian song and music. In Brecht's epic theatre, music and song typically interrupt the action and comment on it rather than smoothing the audience into emotion, often in a deliberately jarring style. This use of sound against the action, rather than supporting it, demonstrates how music can serve critical distance instead of immersion.
Example 2. The charged cut to silence. Many productions build a climax of noise, or an unbearable underscored tension, and then cut suddenly to total silence at the decisive moment. This sound-to-silence contrast shows how the absence of sound can focus attention and heighten a moment more powerfully than any added effect, making silence an active design choice.
Try this
Q1. Name four functions that sound can perform in a production. [4 marks]
- Cue. Any four of: establishing location and time, building atmosphere and mood, signalling or intensifying emotion, driving the action, or commenting on and counterpointing the visible action.
Q2. Explain the difference between diegetic and non-diegetic sound, with an example of each. [3 marks]
- Cue. Diegetic sound exists in the world of the play and is heard by the characters (a ringing phone); non-diegetic sound exists only for the audience and is not heard by the characters (underscoring music).
Q3. Why can silence be considered a powerful sound choice? [3 marks]
- Cue. Because a deliberate cut to silence creates a sharp contrast that focuses attention and heightens tension, often more arresting than any noise, and the interplay of sound and silence shapes the rhythm of a scene.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original12 marksDiscuss how sound and music could be used to create atmosphere and meaning in a play you have studied, and the intended effect on an audience.Show worked answer →
Open by noting that sound is one of the most emotionally powerful design elements, often working on the audience beneath conscious notice.
Develop with specific choices for the chosen play. Distinguish diegetic sound (heard by the characters: a doorbell, a radio, an offstage voice) from non-diegetic sound (heard only by the audience: underscoring, mood music, abstract effects). Show how music can set period, signal emotion, or comment on the action (as in Brecht); how effects can build a world or shock; and how silence can be the most charged sound of all. Consider live versus recorded sound and its immediacy. Tie each to atmosphere and effect.
Reach a judgement: sound shapes the emotional landscape and meaning of a production, often invisibly. Markers reward the diegetic-versus-non-diegetic distinction, specific uses of music, effects and silence, attention to live versus recorded sound, and a clear claim about the audience's response.
Original6 marksExplain the difference between diegetic and non-diegetic sound, with an example of each and its effect.Show worked answer →
Define the terms. Diegetic sound exists within the world of the play and can be heard by the characters, such as a telephone ringing, music from an on-stage radio, or an offstage crowd. Non-diegetic sound exists only for the audience and is not heard by the characters, such as underscoring music or an abstract atmospheric drone.
Give effects and examples: a diegetic doorbell can drive the action and ground the world realistically; non-diegetic underscoring can shape the audience's emotion without the characters' awareness, building tension or tenderness.
Conclude: the distinction is between sound inside the story and sound addressed only to the audience, each used for different purposes. Markers reward accurate definitions, a correct example of each, and a clear note of the different effects.
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