Vestas Feuer by Pamina and Papageno in "The Magic Flute"), which has the same key and time signature and was the subject of a set of variations for cello and piano by Beethoven (WoO 46), written 1801. Lockwood also discerns a precedent set by Mozart involving formal structure: an "Introduzione"; i.e. Beethoven's scene forms a separable initial section of an opera having some degree of integrity of both plot and harmonic plan; Lockwood calls the "Introduzione" a "miniplay". Three of Mozart's operas begin with such an "Introduzione": "Don Giovanni", "Così fan tutte", and "The Magic Flute". Beethoven's "Introduzione" has a harmonic structure
Vienna State Opera The company recruits singers for children's roles in its productions from this opera school. Twice every season there is a special matinée performance of the opera school. In 2006, the 250th anniversary of Mozart's birth, they performed a 20-minute miniature opera "Der kleine Friedrich" arranged from songs of Mozart by Janko Kastelic and Claudia Toman. 80 minutes before each performance, cheap standing room tickets are sold ( to 4). These are popular with all age groups, and now have an almost legendary regular clientele, which is merciless in showing its displeasure with a performance loudly and unambiguously, but is even