Are both Eine florentinische Tragödie and Alceste operas?
Alceste (Gluck) Alceste, Wq. 37 (the later French version is Wq. 44), is an opera by Christoph Willibald Gluck from 1767. The libretto (in Italian) was written by Ranieri de' Calzabigi and based on the play "Alcestis" by Euripides. The premiere took place on 26 December 1767 at the Burgtheater in Vienna.
Der Sprung über den Schatten Der Sprung über den Schatten is a 1924 opera by Ernst Krenek. The work parodied expressionism and psychoanalysis, and prefigured "Jonny spielt auf" in including jazz elements.