The best film score is the one you don't listen to consciously
Which music is used in the film has a major impact on the effect of a scene. Whether, for example, a nature or animal shot "comes across" as cheerful, exciting or scary depends not least on the music. The use of film music is a very conscious decision by the filmmaker and ultimately sets the overall effect and message of a scene. In addition to the music, of course, the language - original sounds (original sounds) and speaker comments - noises (atmos) and even silence are part of the overall concept of the film scene.
Viewers expect variety and find films more appealing when moods change. Even if music is not consciously recorded most of the time, it creates mood and dynamism in the film. For example, very low frequencies are used to create feelings of fear. Friendly chords, on the other hand, create a feel-good situation.
Music has so many possibilities that it can musically shape almost any visual situation and classify it in any mood. It is a psychological device and directs attention in such a way that a scene is perceived in a certain way. Sometimes music is strongly represented quantitatively, sometimes it stands in the background, sometimes it sounds rudimentary, pompous or heroic.