•Why it earns a slot
Why it earns a slot: Nietzsche stages his entire later war on rationalism inside a book ostensibly about Greek stagecraft, naming Socrates himself as the demon who killed tragedy.
Nietzsche claims Greek tragedy was born from two warring gods, dreaming Apollo and drunken Dionysus, and then argues Socrates murdered it by making everything on stage explainable.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.