Which opera is by Christoph Willibald Gluck, Iphigénie en Tauride or Der Barbier von Bagdad?
Iphigénie en Tauride: Iphigénie en Tauride ("Iphigenia in Tauris") is a 1779 opera by Christoph Willibald Gluck in four acts.
i don't know