In the 1984 classic 'Ghostbusters,' composer Elmer Bernstein used the Ondes Martenot to create the spooky, wavering electronic tones associated with the paranormal entities. The Ondes Martenot is an early electronic instrument with a keyboard and a sliding ring that allows for smooth pitch shifts. It has a 'eerie' quality similar to a Theremin but with more melodic control. Bernstein used it to provide a sense of mystery and 'otherworldliness' that contrasted with the film's comedic tone. The instrument’s shimmering sound became part of the 'Ghostbusters' legend, bridging the gap between old-school horror tropes and modern sci-fi action. It remains one of the most famous uses of the instrument in Hollywood history, proving that vintage tech is often the best for scoring movie legends of the supernatural.