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
Haydn and Mozart symphony and a chorus, both probably from [the oratorio] "Il ritorno di Tobia"") and Mozart ("a new concert aria, probably 'Misero! o sogno!' [K. 431], and, on the first night, a piano concerto") At the time of this meeting, Haydn was the most celebrated composer in Europe. Mozart's own reputation was definitely on the rise. His opera "The Abduction from the Seraglio" had been premiered with great success in Vienna, and was being produced in several other cities. Haydn would have been about 52 at the time, Mozart about 28. Jens Peter Larsen suggests that "quartet playing was central to