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 libretto attracted the admiration of Franz Liszt, who after attending a performance copied down several of them in a personal letter. Ingmar Bergman in his 1975 film of the opera gave special treatment to the didactic poetry by having his characters hoist "a series of placards on which these moral sentiments are carefully lettered." The passage quoted above beginning "Zwei Herzen" has attracted particular admiration: Heartz called it "the loveliest of all the opera's beautiful moments"; Abert wrote of "a paradisal radiance unique in this work". Liszt quoted Schikaneder's verse in his letter and appended, "Amen!". A matter that perturbs