Music is a crucial element in thriller films that helps build suspense, tension, and fear. It allows audiences to anticipate jump scares and rising tension. Effective music can improve scenes, as demonstrated in the films Shutter Island, The Sixth Sense, and The Woman in Black. For the author's own thriller film "The Hit," music will be used to gradually increase tension as an assassin prepares to take a shot, keeping audiences gripped as they wonder if agents can stop him in time.