The Magic Flute chorus for several numbers (notably the finales of each act). Mozart also called for a "" (instrument of steel) to perform Papageno's magic bells; an instrument which has since been lost to history, though modern day scholars believe it to be a keyed glockenspiel, which is usually substituted with a celesta in modern-day performances. Charles Rosen has remarked on the character of Mozart's orchestration: "Die Zauberflöte" has the greatest variety of orchestral color that the eighteenth century was to know; the very lavishness, however, is paradoxically also an economy as each effect is a concentrated one, each one—Papageno's whistle, the
Vienna State Opera this way, including performances of "Madama Butterfly", "The Magic Flute" and "Don Giovanni". This successful venture brought a new wave of operatic excitement to the many tourists and locals who experienced this cultural event. During daytime the screen displays a replica of the Opera House's façade, as it obstructs a considerable part of the building, along with information about upcoming performances. The Vienna State Opera is particularly open to children: under Holender's direction (he has three children of his own), the opera house has become well known for its children's productions, which are performed in a tent on the roof