Use this excerpt to answer the question. Hollywood movies originated without sound, and silent movies told stories using visuals only. Eventually, background music was added to create feelings of suspense, melancholy, or romance, but there were no lines of dialogue spoken aloud by actors. As microphone technology improved, the stage was set to add dialogue, and this is when the role of the Foley artist became so important. The movie industry is now known for creating more than silent movies, and Foley artists are part of that industry's work in elevating the viewers' senses. The term Foley artist is named after Jack Foley, an innovator in the realm of sound effects. His vision paved the way for sound to be included in the world of movies and added the dimension that what our eyes miss, our ears will pick up. Which sentences identify the two central ideas expressed in this excerpt?