From Harper's Dictionary of Antiquities:<br /><br />
http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus%3Atext%3A1999.04.0062&query=head%3D%2311088<br /><br /><br />Tragoedia<br />([face=SPIonic]
tragw|di/a[/face] ). I. Tragedy in Greece originated in the lyric dithyramb; i. e. in the song of a chorus at the rites held in honour of Dionysus (see Dionysia). This song, in accordance with the cult of the god, expressed at one time exuberant joy, at another deep sorrow. The cult of Dionysus is also indicated by the very name of tragedy, signifying goat-song; i. e. (according to the usual explanation) the hymn sung by the chorus in their dance round the altar at the sacrifice of the goat (tra/goj ), dedicated to Dionysus. Others derive the name from the fact that, to represent Satyrs, the chorus were clad in goat-skins, and hence resembled goats. These choral songs seem to have received a certain dramatic form as early as the time of Arion , to whom the dithyramb owes its artistic development. The true drama, including tragic and satyric plays, was evolved subsequently in Athens.<br /><br />