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

...and his forehead, as the statues dedicated to him everywhere show, appearing as such. Others say he was not renamed for this reason, but because of the broad, diffuse, and expansive nature of his relaxed character, just as they say Theophrastus was also renamed this way due to the divinity of his phrasing, previously being called Tyrtamus. He had as a music teacher Draco, the student of Damon; he mentions him in the Republic. These three things were taught to the boys in Athens, not simply—I mean reading and writing, music, and wrestling. Not simply, but letters for the sake of adorning the speech within them, music for the sake of taming the spirit, and wrestling for the sake of exercising, in order to strengthen the slackness of the desire. And Alcibiades also appears to have been educated in these three things by him; for which reason Socrates says to him, "Did you not desire the flute?" and the rest. He also attended painters, from whom he benefited in the mixing of colors, of which he makes mention in the Timaeus. After these things, he was also educated by the...