“Sound [or the soundtrack] is that portion of the cinematic medium that contains aural information— dialogue, music, and sound effects;
The three main categories of film sound are dialogue, music, and sound effects. Dialogue includes all the spoken words in a film. Dictionaries define the word dialogue as a conversation between two people (as opposed to monologue—a speech, usually long, by one person). But in film terminology, dialogue refers to any spoken words, including conversations, monologues, random words audible in crowd scenes, and voice-over narration.”
—Film studies: An introduction by Ed Sikov.
