Nor was he content to show off his experiments in these arts to Rome, but as we mentioned, he also sought greatly to move people in Achaia. The cities there (having a tradition of holding musical contests) had all set up awards for singers on the cithara that he himself would win. He would agreeably receive these crowns ... the legates asked him if he would sing at dinner too, and he garrulously declined. "Only Greeks," he said, "are able to appreciate me and are worthy of my efforts." He was no more broad-minded at the time of departure. As his party was starting to leave Cassiope,* he took auspices and then steadily sang a song of Cassius at the local altar of Zeus, proving himself against competitors one after another.
--Suetonius, on Nero (my incomplete translation; thanks to perseus.tufts.edu for the Latin word study tool).
*A city called Cassiope existed on Corfu and this would have been a convenient stopping point on any Achaia-Rome journey.