The House of Atreus Act I, released in 1999 is the first part of a metal opera inspired by the  only extant example of an ancient Greek theatre trilogy which won first prize at what festival?
The House of Atreus Act I The House of Atreus Act I, released in 1999, is the ninth studio album by the American heavy metal band Virgin Steele. It has the subtitle "A Barbaric-Romantic Opera". This album is the first part of a metal opera inspired by the Oresteia, a trilogy of Greek tragedies written by Aeschylus which concerns the end of the curse on the House of Atreus. The music was intended to be the soundtrack for theatrical shows, with actors impersonating the characters of the tragedy. The metal opera was actually performed under the name "Klytaimnestra - The House Of Atreus" in European theatres from 1999 to 2001, with the production of the Memmingen Opera House company and Landestheater Production.
Artaserse (Hasse) Artaserse is an opera ("dramma per musica") in three acts composed by Johann Adolph Hasse to an Italian libretto adapted from that by Metastasio by Giovanni Boldini. It premiered at the Teatro di San Giovanni Grisostomo in Venice on 11 February 1730, shortly after the libretto's first setting by Leonardo Vinci premiered in Rome 6 days earlier. Metastasio's libretto, "Artaserse", has been used in more than 90 works. Hasse himself would later re-work the score for performances at the Opernhaus am Zwinger in Dresden (1740) and the Teatro di San Carlo in Naples (1760).