'Undertone' Review: An unsettling horror film that's meant to be heard

It's amazing how important sound is to horror. Abrupt noises are responsible for at least 90% of all movie scares. Look it up — actually, don't. There's no study to back that up, but it's true. Just believe me.

Watch any horror film on mute — you probably won't jump in your seat once. Revisit the famous shower scene in Alfred Hitchcock's "Psycho." The sight of Norman Bates' silhouette with the knife certainly doesn't bring any comfort, but it's Bernard Herrmann's iconic score — the shrieking violins ...