Music was required for a montage in the middle of the film, and "I Want a New Drug" by Huey Lewis and the News was used as a temporary placeholder because of its appropriate tempo. Reitman was later introduced to Parker Jr. who developed "Ghostbusters" with a similar riff to match the montage. There were approximately 50 to 60 different theme songs developed for "Ghostbusters" by different artists before Parker Jr.'s involvement, though none was deemed suitable. Lewis was approached to compose the film's theme, but was already committed to work on "Back to the Future" (1985).