Final answer:
Musicians used program music to evoke images and convey emotions related to various scenarios in films and radio productions. Program music is intended to underscore actions and scenes, setting the tone for storytelling and aiding in audience visualization of the content.
Step-by-step explanation:
To bring the sounds and emotions associated with railroads, horse chases, love scenes, comic predicaments, and other formulaic situations to viewers' minds, musicians used program music. Program music is a type of orchestral or instrumental composing intended to evoke images or convey the impression of events. It is different from pure music which does not illustrate a story or a scene. Musicians and sound designers often use programmatic elements in scoring for films and radio productions to adapt to the action performed on screen or described in the narration. These musical accompaniments enhance the storytelling by providing an emotional layer and aiding the audience in visualizing the scenes.
In contrast, Diegetic sounds are those that originate from within the film's world, such as the sound of characters talking or items making noise as part of the storyline. Non-diegetic sounds include all sounds that do not exist within the film's world but are used to enhance the experience, like background music. Foley effects are sound effects added to a film in post-production to enhance the auditory experience. While these terms are related to the creation of sound in media, it's program music specifically that is composed with the intent to invoke particular narratives or emotional responses.