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.
Welsh National Opera with the company's musical director James Lockhart, Geliot is credited by "The Times" with introducing new young singers and "directing a host of groundbreaking productions" before leaving in 1978. The critic Rodney Milnes wrote in 1975 about WNO's productions: In 1973 Geliot's WNO staging of Britten's "Billy Budd" with Allen in the title role was presented on a Swiss tour, and two years later it was given in Barcelona. The company returned to London with its participation in the Amoco Festival of Opera at the Dominion Theatre in 1979, presenting "The Makropoulos Case", "The Magic Flute", "Ernani", "Madame Butterfly", and