In this guide
Diegetic sound belongs to the story world; non-diegetic sound comes from outside it. Classify a sound by how the scene presents its source, not by whether it was recorded on set or added later.
Diegetic sound is presented as part of a story’s world: a character speaking, a door closing or a song playing from a radio in the scene. Non-diegetic sound comes from outside that world: for example, an orchestral score added for the audience that the scene does not present as playing in the room.
Ask where the scene places the sound’s source. The source does not have to be visible, and a sound can be added during editing while still representing an object in the story. Columbia’s film glossary defines diegetic sound by its relationship to the narrative world, including voices, objects and music from a radio or instrument.
Diegetic vs. non-diegetic sound at a glance
| Sound | Diegetic example | Non-diegetic example |
|---|---|---|
| Music | A song playing from a café radio in the scene. | A score added to shape the audience’s mood, with no source in the café. |
| Voice | A person speaks to another character in the room. | An external narrator comments over the scene without speaking inside it. |
| Sound effect | A cup lands on a table as part of the action. | A stylized musical sting emphasizes the moment for the audience. |
| Environment | Rain is presented as falling outside the story’s window. | A deliberately artificial sound layer is used as commentary rather than as weather in the story. |
These classifications depend on presentation. A real-world rain recording does not automatically become diegetic just because rain can occur in nature; in one scene it may represent weather, while in another it may function as an abstract effect. The Oklahoma State film and television text describes the basic story-world distinction using dialogue, environmental sound and music.
Examples of diegetic sound
- Dialogue: two characters talk across a table, even if some of the dialogue was rerecorded later.
- A visible action: a character sets down a cup and the edit presents a matching contact sound.
- Off-screen activity: a dog barks in the next room. Its source can belong to the story even when the camera never shows it.
- Music within the scene: a musician performs or a radio plays in a room. The music has a source in the story, whether or not the device is currently in frame.
- Environmental sound: traffic passes outside the story location, establishing the world around the characters.
A sound does not have to be audible to every character at every moment to belong to the fictional world. A distant event may be out of a character’s hearing range. Whether the audience sees the source, or whether the production captured it on set, is a separate question.
Examples of non-diegetic sound
- Underscore: music accompanies a tense scene without being presented as playing from a source in that world.
- External narration: a narrator addresses the audience over images rather than speaking as an audible person in the scene.
- A dramatic sting: an added tone signals surprise to the viewer, with no implied source in the location.
- Editorial sound: a stylized transition effect comments on a cut rather than representing an object in either scene.
The University of Iowa’s film-music overview contrasts music heard as part of the story with score heard by the viewer. Background music is often non-diegetic, but “background” describes its role in the mix, not a definitive category: a radio playing quietly behind dialogue can still be diegetic.
Three cases that need context
Voice-over and a character’s thoughts
A voice-over is a presentation technique, not a complete classification. An external narrator may be non-diegetic; a character speaking from another location through a phone or radio is part of the story world. Internal thoughts and memories can be subjective or ambiguous. Describe how the scene frames them instead of assuming every voice-over has the same relationship to the action.
Foley recorded after filming
A Foley artist may record footsteps in a studio after the picture is shot. If the edit presents those footsteps as the character’s steps, the sound functions diegetically. The recording method and the sound’s narrative role are different decisions. See the Foley guide for a practical recording exercise.
A radio song becomes the score
Imagine a song starts on a visible radio. As the scene cuts away, the song continues clearly over a new location with no radio implied. The presentation can shift from a story-world source toward score. A transition may deliberately blur the boundary; note the cues that support your interpretation rather than forcing a label where the edit leaves it uncertain.
Plan the layers in a short scene
Consider a fictional scene: a person walks into a café, hears a radio and sits down. A score then rises as they read a message. Make a cue sheet before editing:
| Cue | Story role | Editing check |
|---|---|---|
| Door and footsteps | Sounds of actions in the café: diegetic. | Align contacts with the picture and check that the tail is not cut. |
| Radio song | Music from a source in the room: diegetic. | Decide how the source should sound as the camera or character moves. |
| Score over the message | Music for the audience, with no source implied in the room: non-diegetic. | Balance it with dialogue and the radio; make the transition intentional. |
Keep dialogue, effects and music on separate tracks when the project allows. This gives you control over timing and levels without treating an entire finished soundtrack as one inseparable layer. If only a mixed recording is available, the sound effect extractor can test isolating an audible effect; review the attack, tail and bleed. It estimates a source and does not classify its narrative role or guarantee a clean stem. AI downloads require an account and sufficient credits, shown before download.
The sound-effect workflow covers tracking cue positions when returning audio to a video. For interactive material, the game sound-design guide covers triggering and testing effects during play. Use recordings and music you have permission to use; editing or isolating a sound does not grant a license.
Common questions
Is all music non-diegetic?
No. A score with no source in the story is typically non-diegetic, while music presented as playing from a radio or performer in the scene is diegetic. The same song can change role during a transition.
Can diegetic sound be off-screen?
Yes. A character or object can produce sound elsewhere in the story world even when the camera does not show it. The source’s relationship to the story matters more than its visibility.
Is narration always non-diegetic?
No. Voice-over can be framed in different ways, including an external narrator, a character’s account or a voice heard through a device in the scene. Examine how the story presents the voice.
Is a Foley sound diegetic?
Often it represents an action in the story, such as footsteps, and therefore functions diegetically. Foley describes how the sound was performed and recorded; its role depends on how the finished scene uses it.