<P> If Plato's important dialogues do not refer to Socrates' execution explicitly, they allude to it, or use characters or themes that play a part in it . Five dialogues foreshadow the trial: In the Theaetetus (210d) and the Euthyphro (2a--b) Socrates tells people that he is about to face corruption charges . In the Meno (94e--95a), one of the men who brings legal charges against Socrates, Anytus, warns him about the trouble he may get into if he does not stop criticizing important people . In the Gorgias, Socrates says that his trial will be like a doctor prosecuted by a cook who asks a jury of children to choose between the doctor's bitter medicine and the cook's tasty treats (521e--522a). In the Republic (7.517 e), Socrates explains why an enlightened man (presumably himself) will stumble in a courtroom situation . The Apology is Socrates' defense speech, and the Crito and Phaedo take place in prison after the conviction . In the Protagoras, Socrates is a guest at the home of Callias, son of Hipponicus, a man whom Socrates disparages in the Apology as having wasted a great amount of money on sophists' fees . </P> <P> Two other important dialogues, the Symposium and the Phaedrus, are linked to the main storyline by characters . In the Apology (19b, c), Socrates says Aristophanes slandered him in a comic play, and blames him for causing his bad reputation, and ultimately, his death . In the Symposium, the two of them are drinking together with other friends . The character Phaedrus is linked to the main story line by character (Phaedrus is also a participant in the Symposium and the Protagoras) and by theme (the philosopher as divine emissary, etc .) The Protagoras is also strongly linked to the Symposium by characters: all of the formal speakers at the Symposium (with the exception of Aristophanes) are present at the home of Callias in that dialogue . Charmides and his guardian Critias are present for the discussion in the Protagoras . Examples of characters crossing between dialogues can be further multiplied . The Protagoras contains the largest gathering of Socratic associates . </P> <P> In the dialogues Plato is most celebrated and admired for, Socrates is concerned with human and political virtue, has a distinctive personality, and friends and enemies who "travel" with him from dialogue to dialogue . This is not to say that Socrates is consistent: a man who is his friend in one dialogue may be an adversary or subject of his mockery in another . For example, Socrates praises the wisdom of Euthyphro many times in the Cratylus, but makes him look like a fool in the Euthyphro . He disparages sophists generally, and Prodicus specifically in the Apology, whom he also slyly jabs in the Cratylus for charging the hefty fee of fifty drachmas for a course on language and grammar . However, Socrates tells Theaetetus in his namesake dialogue that he admires Prodicus and has directed many pupils to him . Socrates' ideas are also not consistent within or between or among dialogues . </P> <P> Although their popularity has fluctuated over the years, the works of Plato have never been without readers since the time they were written . Plato's thought is often compared with that of his most famous student, Aristotle, whose reputation during the Western Middle Ages so completely eclipsed that of Plato that the Scholastic philosophers referred to Aristotle as "the Philosopher". However, in the Byzantine Empire, the study of Plato continued . </P>

Which of the following did the greek philosophers not believe about music