Music in horror films is without a doubt one of the most important aspects of it as the musics allows the writer to attract the audience in a unique way- the music can control the atmosphere and control the mood of the audience, this can be done by controlling the pace of the music; slow music could indicate that the atmosphere is calm and collective where as fast music could indicate danger, excitement and chaos. There could also be quiet, mysterious music which could make the atmosphere very tense and prepare the audience for a jump scare.
Sound effects
There are many original non diegetic sounds that are very common in most horror films- these noises include: screeching, echoes, foot steps, screams, scraping and many more. These noises are used because the are very effective as they keep the audience on the edge of their seats and they are fairly easy to use; they can also be used for jump scares that come out of nowhere which again is a vital factor that will determine the end product.
Music and sound effects combined make the perfect combination for all horror films as they are basically two of the most important factors in the success criteria for a horror.