Opera in German outskirts of the city. In 1791, he persuaded Mozart to set one of his libretti, "The Magic Flute". This proved to be no ordinary "Singspiel". Though the traditional farcical elements remained, Mozart added a new seriousness, particularly in the music for Sarastro and his priests. Even more than "Die Entführung", the "Magic Flute" pointed the way forward for future German opera. The greatest German composer of the next generation, Beethoven, seized on "The Magic Flute"'s blend of domestic comedy and high seriousness for his only opera, "Fidelio", the story of a devoted wife who saves her husband from political imprisonment.
Piano concertos by Wolfgang Amadeus Mozart it was probably J.C. Bach, whom Mozart admired, who introduced the structural innovation of allowing the keyboard to introduce new thematic material in its first entry. Concertos Nos 1–4 (K. 37, 39, 40 and 41) are orchestral and keyboard arrangements of sonata movements by other composers. The next three concertos (K. 107/1, 2 and 3), which are not numbered, are arrangements of piano sonatas by J.C. Bach (Op 5. Nos. 2, 3, and 4, all composed by 1766). Based on handwriting analysis of the autographs they are believed to date from 1771–72. Concerto No. 5, K. 175 from 1773 was