Film music often tells us how to feel, but it also guides us how to hear. Filmgoing is an intensely musical experience, one in which the soundtrack structures our interpretations and steers our emotions. Hollywood Harmony explores the inner workings of film music, bringing together tools from music theory, musicology, and music psychology in this first ever book-length analytical study of this culturally central repertoire. Harmony, and especially chromaticism, is emblematic of the "film music sound," and it is often used to evoke that most cinematic of feelings-wonder.