Ever wonder people get so emotional to Pixar movies? Or Why the intro to Up is known as one of the most powerful love stories ever? Their shorts rarely have any dialogue yet we feel so attached and emotionally connected to the characters. The reason for this lies in the music.
Music in story telling is very powerful. It establishes character themes, emotions within the character, danger, amongst other things. It's more than just major for happy, minor for sad, and dissonance for danger and anxiety. Youtube channel Sideways elaborates on the reasons why in the video below: