Commentary on the First Alcibiades of Plato (Cambridge, University Library, MS Kk.5.27)

...strategists, who were called the educators of Greece. He approached them because of the aphoristic and solemn nature of tragedy, and the heroic quality of the subjects. He also engaged with the dithyrambs, for the honor of Dionysus, who is called the overseer of generation birth/becoming; for the dithyramb was dedicated to him, from which it also has its name. For the dithyramb is Dionysus, as one having come out of two doors—both of Semele and the thigh of Zeus. The ancients were accustomed to naming the things caused by the names of the causes, just as they call wine "Dionysus"; for which reason Proclus also says about this, that "they spoke of children to the parents." That Plato was also trained in dithyrambs is clear from the Phaedrus dialogue, which breathes a very dithyrambic character; since Plato wrote this dialogue first, as it is said. He also rejoiced greatly in Aristophanes, the comic and sensible one, from whom he also benefited in the imitation of the characters in the dialogues. It is said he delighted in them so much that even when he died, he was found...