Sophocles

“ She denies all knowledge of the oxen, but incidentally mentions that one of the appurtenances of the lyre (as far as I can judge from the defective text, the bag in which it is kept) is made of ox-hide. The circumstance excites the suspicion of the Satyrs, but Cyllene persists in her denials, maintaining that it is a blasphemous absurdity to bring a charge of theft against the child. Ultimately the Satyrs espy some ox-dung and insist, with a threat of personal violence, that Cyllene should produce the oxen. ”

“ Cyllene, but speaks of the oxen as having been left by him at Pylos, Sophocles puts the oxen also on Mt. Cyllene. He clearly takes this course in order to observe the dramatic unity of place.
Fourthly, in the Hymn there is no sort of connexion, direct or indirect, between the theft of the oxen and the making of the lyre. Sophocles introduces a connexion by representing Hermes' use of ox-hide, taken from the stolen cattle, in or about the lyre as furnishing the Satyrs with the clue which led to their recovery. Dramatic unity of action demands a connexion. ”

“ Secondly, as a result of introducing Silenus and the Satyrs, Sophocles attributes the discovery of the oxen to their activities, not, as the Hymn, to information given to Apollo by a countryman who had seen Hermes driving the cattle. ”