Question: Ludwig Wenzel Lachnith was influenced by which Austrian "Father of the Symphony?"
Context: The Symphony No. 9 in D minor, Op.  125, is the final complete symphony composed from 1822 to 1824 by the German composer Ludwig van Beethoven.  It was first performed in Vienna on 7 May 1824.  The symphony is one of the best-known works in common practice music.  It is widely viewed by critics as one of Beethoven's greatest works, the pinnacle of musical Classicism, and one of the greatest compositions in the western musical canon.  The symphony was the first example of a major composer using voices in a symphony (thus making it a choral symphony).  The words are sung during the final movement by four vocal soloists and a chorus.  They were taken from the "Ode to Joy", a poem written by Friedrich Schiller in 1785 and revised in 1803, with text additions made by the composer.  In the 2010s, it stands as one of the most performed symphonies in the world. The Battle of Piacenza was fought between a Franco-Spanish army and the Austrian army near Piacenza, in Northern Italy on June 16, 1746.  It formed part of later operations in the War of the Austrian Succession.  The result was a victory for the Austrian forces, led by Prince Josef Wenzel. Franz de Paula Adam Norbert Wenzel Ludwig Valentin von Waldstein (14 February 1759 – 24 May 1823) was an Austrian soldier, explorer and naturalist. Wenzel Anton, Prince von Kaunitz-Rietberg (German: "Wenzel Anton Fürst von Kaunitz-Rietberg" , ; 2 February 1711 – 27 June 1794) was an Austrian and Czech diplomat and statesman in the Habsburg Monarchy.  A proponent of enlightened absolutism, he held the office of State Chancellor for about four decades, responsible for the foreign policies under the reign of Maria Theresa, Joseph II, and Leopold II.  In 1764 he was elevated to the noble rank of a Prince of the Holy Roman Empire ("Reichfürst"). Philipp Ludwig Wenzel Sinzendorf (26 December 1671 – 8 February 1742) was an Austrian diplomat and statesman who for nearly four decades served as Court Chancellor responsible of foreign affairs of the Habsburg Monarchy. Ludwig Wenzel Lachnith (Prague, July 7, 1746 – Paris, October 3, 1820) was a Bohemian horn player and versatile composer influenced by Joseph Haydn and Ignaz Pleyel.  Today he is chiefly remembered because of his adaptions of operas by Wolfgang Amadeus Mozart.  The French composer and writer Hector Berlioz immortalized him in a diatribe in his autobiography. Wenzel Robert von Gallenberg (28 December 1783 – 13 March 1839) (full name Johann Wenzel Robert Maria Joseph Sigmund Seyfried, Count Gallenberg) was an Austrian composer, particularly of ballets, which were produced in Vienna and Italy. Ludwig August von Rochau (20 August 1810 in Wolfenbüttel – 15 October 1873 in Heidelberg) was a German journalist and politician.  He engaged in the "Frankfurter Wachensturm" of 1833 and subsequently spent ten years of exile in France.  He published the famous "Grundsätze der Realpolitik, angewendet auf die staatlichen Zustände Deutschlands" ("Practical Politics: an Application of its Principles to the Situation of the German States") in 1853.  From this work, the Austrian diplomat Klemens Wenzel, Prince von Metternich coined the term "Realpolitik," a political philosophy based on a practical or pragmatic approach to political policy. (Franz) Joseph Haydn ( ; ] ; 31 March 173231 May 1809) was an Austrian composer of the Classical period.  He was instrumental in the development of chamber music such as the piano trio and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet". Anna Wenzel (born February 2, 1980 in Vienna) is an Austrian former competitive figure skater.  She is the 2001 Austrian national champion.  She reached the free skate at two ISU Championships – the 1998 Junior Worlds in Saint John, New Brunswick, where she placed 20th; and the 2001 Europeans in Bratislava, where she finished 18th.  Her older sister, Marie-Theres Wenzel, also competed internationally for Austria.
Answer: Joseph Haydn