Viorica Cortez is a noted Romanian-born mezzo-soprano, later French by naturalisation. Starting her operatic and concert career in the mid-1960s, she went on to become one of the most prominent female performers of the '70s and '80s. An example of professional longevity, she is present on some of the most prestigious European opera scenes.

Don Carlos is an 1867 five-act grand opera composed by Giuseppe Verdi to a French-language libretto by Joseph Méry and Camille du Locle, based on the dramatic play Don Karlos, Infant von Spanien by Friedrich Schiller. In addition, several incidents, of which the Forest of Fontainebleau scene and auto-da-fé were the most substantial, were borrowed from Eugène Cormon's 1846 play Philippe II, Roi d'Espagne. The opera is most often performed in Italian translation, usually under the title Don Carlo.