tragedyyoudaoicibaDictYouDict
tragedy: [14] Etymologically, a tragedy is probably a ‘goat-song’. The word comes via Old French tragedie and Latin tragoedia from Greek tragōidíā, a compound formed from trágos ‘goat’ and ōidé ‘song’ (source of English ode, parody, rhapsody, etc). It is thought that the underlying reference may be to a sort of ancient Greek drama in which the chorus were dressed as satyrs, goatlike woodland deities.
=> melody, ode, parody, prosody, rhapsody
tragedian (n.)youdaoicibaDictYouDict
"writer of tragedies," late 14c., from Old French tragediane (Modern French tragédien), from tragedie (see tragedy). Another word for this was tragician (mid-15c.). Meaning "actor in tragedies" is from 1590s. French-based fem. form tragedienne is from 1851. In late classical Greek, tragodos was the actor, tragodopoios the writer.
tragedy (n.)youdaoicibaDictYouDict
late 14c., "play or other serious literary work with an unhappy ending," from Old French tragedie (14c.), from Latin tragedia "a tragedy," from Greek tragodia "a dramatic poem or play in formal language and having an unhappy resolution," apparently literally "goat song," from tragos "goat" + oide "song" (see ode).

The connection may be via satyric drama, from which tragedy later developed, in which actors or singers were dressed in goatskins to represent satyrs. But many other theories have been made (including "singer who competes for a goat as a prize"), and even the "goat" connection is at times questioned. Meaning "any unhappy event, disaster" is from c. 1500.
tragedienneyoudaoicibaDictYouDict
"An actress who specializes in tragic roles", Mid 19th century: from French tragédienne, feminine of tragédien.