Eust. prooem. Pind. 27 (iii 299s. Drachmann)
εἰς ποιητικὴν ἐτράπη (sc. ὁ Πίνδαρος) καθηγησαμένων αὐτῷ τοῦ μαθεῖν ἢ τοῦ Λάσου, ὡς εἴρηται, ἢ τοῦ Ἀθηναίου Ἀγαθοκλέους ἢ Ἀπολλοδώρου, ὅν φασι καὶ προϊστάμενον κυκλίων χορῶν καὶ ἀποδημοῦντα πιστεῦσαι τὴν διδασκαλίαν Πινδάρῳ παιδὶ ὄντι· τὸν δὲ εὖ τὸ πιστευθὲν διακοσμήσαντα περιβοηθῆναι.
Life and Work
Eustathius, Introduction to Pindar
Pindar then turned to poetry and was taught the art either by Lasus, as I mentioned earlier, or by the Athenian Agathocles or by Apollodorus. They say that Apollodorus was in charge of circular choruses1 and that when he was out of the city he entrusted their training to Pindar, who was still only a boy2; Pindar handled his assignment well and became the talk of the town.