The Magic Flute the Night, evidently needed little such help: this role is famous for its difficulty. In ensembles, Mozart skillfully combined voices of different ability levels. The vocal ranges of two of the original singers for whom Mozart tailored his music have posed challenges for many singers who have since recreated their roles. Both arias of the Queen of the Night, "O zittre nicht, mein lieber Sohn" and "Der Hölle Rache kocht in meinem Herzen" require high F, rare in opera. At the low end, the part of Sarastro, premiered by Franz Xaver Gerl, includes a conspicuous F in a few locations.
Libretto of The Magic Flute to draw a generalized observation from the proceedings on stage in order to promote virtue or condemn vice." Cairns attributes a taste for "didactic sentiment" specifically to the Viennese popular theater. Concerning "The Magic Flute" specifically, Rosen writes that it "develops ... a conception of music as a vehicle for simple moral truths." The opera's didacticism is concentrated in passages of poetry, set in the ensemble scenes, in which the characters cease to converse with each other and join in singing an edifying lesson to the audience. One example is found in the first act, just after Monostatos and his