So Forbidden Planet is the first major film to have an all-electronic score. It was made by Bebe and Louis Barron who were not referred to as musicians so as not to offend the musicians' union and instead their score was described as "Electronic Tonalities". The sounds were created via circuits made by Louis. This was before commercial synthesizers existed. Early electronic music was mostly made with things like scientific test equipment, tone generators, home made circuits, or manipulated tape. #Monsterdon