The Deipnosophists (1.37)

Now of tragic dancing, as it was called, such as it existed in his time, Bathyllus of Alexandria was the first introducer; whom Seleucus describes as having been a legitimate dancer. This Bathyllus, according to the account of Aristonicus, and Pylades too, who has written a treatise on dancing, composed the Italian dance from the comic one which was called κόρδαξ, and from the tragic dance which was called ἐμμέλεια, and from the Satyric dance which was called σίκιννις, (from which also the Satyrs were called σικιννισταί,) the inventor of which was a barbarian named Sicinnus, though some say that Sicinnus was a Cretan. Now, the dance invented by Pylades was stately, pathetic, and laborious; but that of Bathyllus was in a merrier style; for he added to his a kind of ode to Apollo. But Sophocles, in addition to being eminent for personal beauty, was very accomplished in music and dancing, having been instructed in those arts while a boy by Lamprus, and after the naval victory of Salamis, he having no clothes on, but only being anointed with oil, danced round the trophy erected on that occasion to the music of the lyre, but some say that he had his tunic on; and when he exhibited his Thamyris he himself played the harp; and he also played at

ball with great skill when he exhibited his Nausicaa. And Socrates the Wise was very fond of the dance Memphis; and as he was often caught dancing, as Xenophon relates, he said to his friends that dancing was a gymnastic exercise for every limb; for the ancients used the word ὀρχέομαι for every sort of motion and agitation. Anacreon says—

The fair-hair'd maids of mighty Jove

Danced lightly in the mystic grove;

and Ion has the expression—

This strange occurrence makes my heart to dance.