The video 'Origin of Everything: How a Spy Changed Horror Movies' explores the fascinating intersection of sound design, espionage, and the impact of specific sound effects on horror films. It delves into the use of non-diegetic and diegetic sounds—a crucial educational concept in film studies—highlighting the theremin, an eerie instrument invented by Soviet physicist Lev Theremin. His invention, originally for Soviet military use, became iconic in horror movie soundscapes. Additionally, the video unravels the story of the Wilhelm scream, a ubiquitous diegetic sound effect that's found new life in modern cinema. By contextualizing these sounds' historical significance and their adaptation in film, the video educates on the importance of sound in setting mood and signaling events in movies, providing a unique perspective on both music and history.