What genre are both Euridice and Der Kaiser von Atlantis?
Euridice (Peri) Euridice (also Erudice or Eurydice) is an opera by Jacopo Peri, with additional music by Giulio Caccini. It is the earliest surviving opera, Peri's earlier "Dafne" being lost. (Caccini wrote his own "Euridice" even as he supplied music to Peri's opera, published this version before Peri's was performed, in 1600, and got it staged two years later.) The libretto by Ottavio Rinuccini is based on books X and XI of Ovid's "Metamorphoses"
Simplicius (operetta) Simplicius is an operetta by Johann Strauss II. It was conceived from the work of HJC von Grimmelhausen titled "Der abenteuerliche Simplicissimus" or simply "Adventurous Simplicissimus", which was opined by many to be the 17th century's greatest German novel. The libretto for this work was furnished by Victor Léon who was one of Vienna's promising talents of that era, with music by Johann Strauss II.