The work of the movie music composer is featured, and the importance of their work within the overall fabric of the movie highlighted, the composer often described as being just like another screenwriter in advancing the movie story. Some iconic movie theme music has moved into the realm of general culture. Landmark scores for specific movies mark turning points in the way composers in general have approached movie scoring. The science of the effect of movie music is discussed from a psychologist's perspective. The work of key film composers are highlighted. The advance of of technology and changing musical tastes have also affected the approach to movie scoring over time. Some composers talk about the reason they either do or do not take on the associated role of conductor. The hijacking of movie scores for other uses, sometimes without the consent of the composer, is discussed. And the move from other roles within the music industry into film scorer is discussed.