The sound is a technical part of filmmaking which is as important as lightning, colours, representation, editing etc. Sound effects and music can help to build tension and increase importance of a scene among other things. Sound weaves the story by setting a mood and evoking specific emotions for the audience at the points they are supposed to feel them, especially where no traditional narrative is present. There is something intuitive about the emotions we experience from music and that combined with inspiring and fascinating visuals creates an unbelievable experience. The importance of sound can't be underestimated. Without it films would not exist in the form we are used to know them. Even silent movies weren't truly silent because the background had a music that was setting a certain mood. Effective use of sound and music helps to feel the emotions and understand the story. That's why it's very important not to underestimate the power of sound.