How were they used as background music?

Background music can create the desired atmosphere, convey emotions, add to the setting, provide additional depth and texture by setting the scene's overall "Mood, Tone and Sound Environment" to enhance narrative storylines to make scenes or actions feel exciting when they're actually slow moving, scary scenes more suspenseful by increasing tension, build anticipation or a "sense of drama/urgency when something important is about to happen," establish or transition emotional tone during dramatic moments within movies and TV shows; they give viewers an idea about how they should be feeling. Some soundtracks might make viewers or listeners to feel "happy, sad, anxious, or nostalgic as background music enhances and emphasizes important plot points throughout storytelling arcs.

- Background music can set the mood or feeling of a show

- Create atmosphere and ambiance to help viewers understand where we are

- Helps set a specific time during history as music changes throughout different time periods; like classical (Medieval Renaissance), jazz (the Roaring Twenties), disco/glam rock (Seventies-Eighties).