The Greek tragedies have provided ample sources for opera.
Indeed, Elektra and King Priam have been the basis for such operas as Wozzeck, Parsifal, Faust, and even Carmen.
It’s interesting that the word “tragedy” derives from tragos, meaning “goat song,” and aeidein, “to sing.”
Scholars indicate that this references a goat being the prize in a singing competition.