Question: Who was the father of the composer of Clarinet Quintet?

full_context: Document 1: Franz Xaver Wolfgang Mozart: Franz Xaver Wolfgang Mozart (26 July 1791 – 29 July 1844), also known as Wolfgang Amadeus Mozart, Jr., was the youngest child of six born to Wolfgang Amadeus Mozart and his wife Constanze. He was the younger of his parents' two surviving children. He was a composer, pianist, conductor, and teacher from the late classical period whose musical style was of an early Romanticism, heavily influenced by his father's mature style.
Document 2: Wolfgang Amadeus Mozart: Wolfgang Amadeus Mozart (/ ˈwʊlfɡæŋ æməˈdeɪəs ˈmoʊtsɑːrt / MOHT - sart; German: (ˈvɔlfɡaŋ amaˈdeːʊs ˈmoːtsaʁt); 27 January 1756 -- 5 December 1791), baptised as Johannes Chrysostomus Wolfgangus Theophilus Mozart, was a prolific and influential composer of the Classical era.
Document 3: Violin Sonata No. 35 (Mozart): It is the last of Mozart's substantial violin sonatas, with the only remaining work he wrote for this combination, the sonata in F, K. 547 of 1788 being more of a sonatina. It is also considered by several authors, including Alfred Einstein, to be part of his last series of three great violin sonatas which starts with the Regina Strinasacchi sonata in B-flat K. 454 from 1784 (his annus mirabilis, the year also of the six great piano concertos 14 – 19 and the quintet for piano and winds) and continuing with the E-flat violin sonata from December 1785. The first movement is a movement in sonata form in 6/8 time, with more evenly divided contributions between the two instruments than in the earliest of his sonatas, an exposition divided between its two tonal groups (A and E major), and a compact but unwasteful development section.
Document 4: Mozart's birthplace: Mozart's birthplace (German: ' or ') was the birthplace of Wolfgang Amadeus Mozart at No. 9 Getreidegasse in Salzburg, Austria. The Mozart family resided on the third floor from 1747 to 1773. Mozart himself was born here on 27 January 1756. He was the seventh child of Leopold Mozart, who was a musician of the Salzburg Royal Chamber.
Document 5: String Quartet No. 15 (Mozart): Wolfgang Amadeus Mozart's String Quartet No. 15 in D minor, K. 421/417b is the second of the Quartets dedicated to Haydn and the only one of the set in a minor key. Though undated in the autograph, it is believed to have been completed in 1783, while his wife Constanze Mozart was in labour with her first child Raimund. Constanze stated that the rising string figures in the second movement corresponded to her cries from the other room.
Document 6: Eine kleine Nachtmusik: Eine kleine Nachtmusik (Serenade No. 13 for strings in G major), K. 525, is a 1787 composition for a chamber ensemble by Wolfgang Amadeus Mozart. The German title means ``a little serenade '', though it is often rendered more literally but less accurately as`` a little night music.'' The work is written for an ensemble of two violins, viola, and cello with optional double bass but is often performed by string orchestras.
Document 7: String Quartet No. 18 (Mozart): Wolfgang Amadeus Mozart's String Quartet No. 18 in A major, K. 464, the fifth of the Quartets dedicated to Haydn, was completed in 1785. Mozart's autograph catalogue states as the date of composition ""1785. / the 10th January"". It is in four movements:
Document 8: Clarinet Quintet (Brahms): Johannes Brahms's Clarinet Quintet in B minor, Op. 115 was written in 1891 for the clarinettist Richard Mühlfeld. It is scored for a clarinet in A with a string quartet. It has a duration of approximately thirty-five minutes.
Document 9: Wolfgang Amadeus Mozart: Wolfgang Amadeus Mozart was born on 27January 1756 to Leopold Mozart (1719–1787) and Anna Maria, née Pertl (1720–1778), at 9 Getreidegasse in Salzburg. This was the capital of the Archbishopric of Salzburg, an ecclesiastic principality in what is now Austria, then part of the Holy Roman Empire. He was the youngest of seven children, five of whom died in infancy. His elder sister was Maria Anna Mozart (1751–1829), nicknamed "Nannerl". Mozart was baptised the day after his birth, at St. Rupert's Cathedral in Salzburg. The baptismal record gives his name in Latinized form, as "Joannes Chrysostomus Wolfgangus Theophilus Mozart". He generally called himself "Wolfgang Amadè Mozart" as an adult, but his name had many variants.
Document 10: Symphony, K. 45b (Mozart): This work was only known to Ludwig Ritter von Köchel as an incipit in the catalogue of Breitkopf & Härtel, and thus it was placed in the Anhang as K. Anh. 214. Alfred Einstein then discovered a set of parts in the Berlin State Library with the title ""Synfonia Ex Bb...Del Sigr. cavaliere Amadeo Wolfgango Mozart Maestro di concerto di S.A. á Salisburgo"". Wolfgang became the Concertmaster to the Archbishop of Salzburg in November 1769, and was given the title "cavaliere" in July 1770, but as this is a later copy, this information cannot be used for dating purposes. Einstein believed the symphony to date from early 1768 on stylistic grounds; Neal Zaslaw and Gerhard Allroggen believe even earlier dates to also be possible, and Zaslaw dated the symphony cautiously to Salzburg in 1767. Einstein also believed that the symphonies in the catalogue of Breitkopf & Härtel were sent by Leopold Mozart to be published.
Document 11: Joseph Lange: Joseph Lange (Würzburg, 1 April 1751 – Vienna, 17 September 1831) was an actor and amateur painter of the 18th century. Through his marriage to Aloysia Weber, he was the brother-in-law of Wolfgang Amadeus Mozart.
Document 12: Biographies of Mozart: Wolfgang Amadeus Mozart died after a short illness on 5 December 1791, aged 35. His reputation as a composer, already strong during his lifetime, rose rapidly in the years after his death, and he became (as he has remained to this day) one of the most celebrated of all composers.
Document 13: Clarinet Quintet (Mozart): Wolfgang Amadeus Mozart's Clarinet Quintet, K. 581, was written in 1789 for the clarinetist Anton Stadler. A clarinet quintet is a work for one clarinet and a string quartet (two violins, a viola and a cello). Although originally written for basset clarinet, in contemporary performances it is usually played on a clarinet in A or B-flat for convenience's sake. It was Mozart's only completed clarinet quintet, and is one of the earliest and best-known works written especially for the instrument. It remains to this day one of the most admired of the composer's works. The quintet is sometimes referred to as the Stadler Quintet; Mozart so described it in a letter of April 1790. Mozart also wrote a trio for clarinet, viola and piano for Stadler, the so-called "Kegelstatt Trio", in 1786.
Document 14: Sinfonia Concertante for Four Winds: The Sinfonia Concertante for Four Winds in E flat major is a work thought to be by Wolfgang Amadeus Mozart, for oboe, clarinet, horn, bassoon, and orchestra, K. 297b (Anh. C 14.01). He originally wrote a work for flute, oboe, horn, bassoon, and orchestra, K. Anh. 9 (297B), in Paris in April 1778. There is considerable debate about the relation of the work as it is performed today to this original work.
Document 15: Luigi Gatti: Luigi Gatti (October 7, 1740 – March 1, 1817) was a classical composer. He was born in Lazise in 1740, the son of an organist, Francesco della Gatta. He was ordained a priest in Mantua. In the 1780s he became Hofkapellmeister in Salzburg and Leopold Mozart showed his irritation at not receiving it himself. Between 1801 and 1804 Gatti helped Mozart's sister, Nannerl to locate unknown pieces by Mozart. He died in Salzburg in 1817.
ground_truth: Leopold Mozart
sub_queries: Clarinet Quintet >> composer Answer: Wolfgang Amadeus Mozart
Who was the dad of Wolfgang Amadeus Mozart ? Answer: Leopold Mozart