This isn't a philosophical question per se; but asking for some clarifying background information on a classic book of philosophy.
In Platos dialogue Apologia Socrates mentions that Anaxagoras books are available to purchase for a drachma in the Orchestra:
Socr. O wonderful Melitus, how come you to say this? Do I not, then, like the rest of mankind, believe that the sun and moon are gods?
Mel. No, by Jupiter, O judges! for he says that the sun is a stone, and the moon an earth.
Socr. You fancy that you are accusing Anaxagoras, my dear Melitus, and thus you put a slight on these men, and suppose them to be so illiterate as not to know that the books of Anaxagoras of Clazomene are full of such assertions. And the young, moreover, learn these things from me, which they might purchase for a drachma, at most, in the orchestra, and so ridicule Socrates, if he pretended they were his own, especially since they are so absurd? I ask then, by Jupiter, do I appear to you to believe that there is no god?
This, at least to modern sensibilities seems strange. Is this because in Platos time the muses were associated to the music & poetry and thus by extension to astronomy and the sciences? What actually is an orchestra in Platos time? It surely cannot be a group of musicians - perhaps where they 'hang out'? (It may of course be that this isn't the most appropriate translation of the word).