Question: Which opera is by Christoph Willibald Gluck, Iphigénie en Tauride or Der Barbier von Bagdad?
Related documents: [0]  [DOC] Der Barbier von Bagdad ("The Barber of Baghdad") is a comic opera in two acts by Peter Cornelius to a German libretto by the composer, based on "The Tale of the Tailor" and "The Barber’s Stories of his Six Brothers" in "One Thousand and One Nights". The first of three operas by Cornelius, the piece was first performed at the Hoftheater in Weimar on 15 December 1858. [END] 
[1]  [DOC] Iphigénie en Tauride ("Iphigenia in Tauris") is a 1779 opera by Christoph Willibald Gluck in four acts. It was his fifth opera for the French stage. The libretto was written by Nicolas-François Guillard. [END] 
Answer: 
Iphigénie en Tauride
Iphigénie en Tauride