Much has been written about the filmmaker Charles Chaplin, but not so much about the musician and composer he also was. But even less has been written about the interdisciplinary union between film and music in Chaplin's multifaceted figure. This brief book for both amateur and specialist audiences attempts to explore this under-explored field in a style that ranges from essay to filmic analysis. Divided into three parts, the first one develops the conceptual and categorical limitations when used on the multifaceted figure of Charles Chaplin, who is usually classified as a filmmaker, hiding his interesting facet as a composer and musician. The second part comments on his connections with the composers of his time and analyzes in a general way his music and sounds used in his films. Finally, in the third part, there is a brief musical-sound analysis of some scenes from three of his most outstanding films ("Modern Times", "The Great Dictator" and "Candilejas"). In addition, the relationship of music and sound with aspects of the image, the plot of the film, his ideas, etc., is analyzed here.