The main source of information on Cynaethus is a Scholium to Pindar's second Nemean ode. This tells us that the school of Cynaethus was prominent among the Homeridae and put out many of their own compositions under Homer's name, Cynaethus himself composing the Hymn. He was the first to recite the Homeric poems at Syracuse, which he did during the 69th Olympiad (504-501 BC). It was once argued that the dating made no sense because the Homeric poems must have reached Syracuse much earlier. However, the original date corresponds well to a probable date of composition of the Homeric Hymn to Apollo, 522 BC.
- This is found, with slightly different readings, in the Scholia Vetera in Pindari Carmina (ed. Drachmann), Nemean 2, scholium 1c, and in Fragmenta Historicorum Graecorum (ed. Müller) 4.433, Hippostratus frag. #4. The scholium was picked up without reference to the Hymn in the 'modern commentaries' of Thomas Magister and Demetrius Triclinius, Scholia Recentiora Thomano-Tricliniana in Pindari Nemea et Isthmia (ed. Mommsen) #2.
- Therefore, in the 19th century Welcker (Epischer Cyclus, p. 243) proposed reading «κατὰ τὴν ἕκτην ἢ τὴν ἐννάτην Ὀλυμπιάδα» ("during the sixth or the ninth Olympiad"), instead of «κατὰ τὴν ἑξηκοστὴν ἐννάτην Ὀλ.» ("during the sixty-ninth Olympiad"), and dating Cynaethus to about 750 BC.
- Eustathius, Commentarii in Homeri Iliadem 1.10sq. (ed. Van der Valk)
- Burkert, Walter. "Kynaithos, Polycrates and the Homeric Hymn to Apollo" in Arktouros: Hellenic Studies Presented to B. M. W. Knox (edd. G. W. Bowersock, W. Burkert, M. C. J. Putnam). Berlin: De Gruyter, 1979, pp. 53–62.
- West, M. L. "Cynaethus' Hymn to Apollo". The Classical Quarterly, New Series, Vol. 25, No. 2 (Dec. 1975), pp. 161–170.
- West, M. L. "The Invention of Homer". The Classical Quarterly, New Series, Vol. 49, No. 2 (1999), pp. 364–382.