The quote 'Who you gonna call?' is inseparable from the high-energy theme of 'Ghostbusters.' However, Elmer Bernstein’s orchestral score utilized the Ondes Martenot to represent the supernatural elements of the film. Invented in 1928, the Ondes Martenot is an early electronic instrument featuring a keyboard and a sliding ring that allows the player to produce wavering, 'eerie' tones. It was used to create the shimmering, spooky sounds of the ghosts and the ominous presence of Gozer. This provided a classical horror texture that contrasted with the film's comedic dialogue. The instrument’s ability to glide smoothly between pitches made it the perfect 'voice' for the paranormal. Its use in such a mainstream comedy legend helped keep the rare instrument alive in the public consciousness, proving that even fun quotes benefit from a sophisticated, creepy instrumental backing.