Pseudo-Plutarch, De musica
Goodwin, Ed.

Now that the right moulding or ruin of ingenuous manners and civil conduct lies in a well-grounded musical education, Aristoxenus has made apparent. For, of those that were contemporary with him, he gives an account of Telesias the Theban, who in his youth was bred up in the noblest excellences of music, and moreover studied the works of the most famous lyrics, Pindar, Dionysius the Theban, Lamprus, Pratinas, and all the rest who were accounted most eminent; who played also to perfection upon the flute, and was not a little industrious to furnish himself with all those other accomplishments of learning; but being past the prime of his age, he was so bewitched with the theatre's new fangles and the innovations of multiplied notes, that despising those noble precepts and that solid practice to which he had been educated, he betook himself to Philoxenus and Timotheus, and among those delighted chiefly in such as were most depraved with diversity of notes and baneful innovation. And yet, when he made it his business to make verses and labor both ways as well in that of Pindar as that of Philoxenus, he could have no success in the latter. And the reason proceeded from the truth and exactness of his first education.