Which composer worked closely with both Joseph Sonnleithner and Luigi Cherubini both in personal and professional capacities?
Joseph Sonnleithner Joseph Ferdinand Sonnleithner (3 March 1766 – 25 December 1835) was an Austrian librettist, theater director archivist and lawyer. He was the son of Christoph Sonnleithner, brother of Ignaz von Sonnleithner and uncle of Franz Grillparzer and Leopold von Sonnleithner. He was a personal friend and attorney of Ludwig van Beethoven, and he wrote numerous librettos, among them, Beethoven's stage opera "Fidelio", "Faniska" by Luigi Cherubini and "Agnes Sorel" by Adalbert Gyrowetz.
Josef Pasternack Josef Alexander Pasternack (7 July 1881 – 29 April 1940) was a conductor and composer in the first half of the 20th century.