paragraph_text: Structures I (1952) and Structures II (1961) are two related works for two pianos, composed by the French composer Pierre Boulez.

paragraph_text: Wolfgang Amadeus Mozart's Piano Sonata No. 9 in D major, K. 311 / 284c, was written on the composer's stay in Augsburg and Mannheim in November-December 1777, and is contemporaneous with his Sonata K. 309 (Mozart wrote his Sonata K. 310 in the summer of the following year, in Paris). The three sonatas K. 309–311 were published as a set 'Opus IV' in about 1782, by Franz Joseph Heina in Paris.

paragraph_text: Improvisation stands at the centre of Chopin's creative processes. However, this does not imply impulsive rambling: Nicholas Temperley writes that "improvisation is designed for an audience, and its starting-point is that audience's expectations, which include the current conventions of musical form." The works for piano and orchestra, including the two concertos, are held by Temperley to be "merely vehicles for brilliant piano playing ... formally longwinded and extremely conservative". After the piano concertos (which are both early, dating from 1830), Chopin made no attempts at large-scale multi-movement forms, save for his late sonatas for piano and for cello; "instead he achieved near-perfection in pieces of simple general design but subtle and complex cell-structure." Rosen suggests that an important aspect of Chopin's individuality is his flexible handling of the four-bar phrase as a structural unit.

paragraph_text: Disma Fumagalli (born Inzago, 8 September 1826 - died Milan, 9 March 1893) was an Italian composer and teacher of music. He was a graduate of the Milan Conservatory, where he began teaching piano in 1853. He composed more than 300 études for piano, as well as other exercises; he also wrote a concerto for piano and string orchestra.

paragraph_text: Ludwig van Beethoven's Piano Sonata No. 6 in F major, Op. 10, No. 2, was dedicated to the Countess Anne Margarete von Browne, and written from 1796 to 1798.

paragraph_text: Carl Czerny (German: [ˈtʃɛɐ̯ni]; 21 February 1791 – 9 August 1857) was an Austrian composer, teacher, and pianist of Czech origin whose vast musical production amounted to over a thousand works. His books of studies for the piano are still widely used in piano teaching.

paragraph_text: Alf Wilhelm Lundberg (born 8 May 1979 in Haugesund, Norway) is a Norwegian Jazz musician (guitar and piano) and composer.

paragraph_text: Wolfgang Amadeus Mozart's Piano Sonata No. 6 in D major, K. 284 / 205b, (1775) is a sonata in three movements:

paragraph_text: All of Chopin's compositions include the piano. Most are for solo piano, though he also wrote two piano concertos, a few chamber pieces, and some songs to Polish lyrics. His keyboard style is highly individual and often technically demanding; his own performances were noted for their nuance and sensitivity. Chopin invented the concept of instrumental ballade. His major piano works also include mazurkas, waltzes, nocturnes, polonaises, études, impromptus, scherzos, preludes and sonatas, some published only after his death. Influences on his compositional style include Polish folk music, the classical tradition of J. S. Bach, Mozart and Schubert, the music of all of whom he admired, as well as the Paris salons where he was a frequent guest. His innovations in style, musical form, and harmony, and his association of music with nationalism, were influential throughout and after the late Romantic period.

paragraph_text: Dmitri Shostakovich's Piano Sonata No. 2 in B minor, Op. 61 was composed in 1943 in Samara, where he had been evacuated due to the Siege of Leningrad, and was premiered by Shostakovich himself on June 6, soon after moving to Moscow. It was his first piano composition since the 1933 Preludes op.34.

paragraph_text: Florentina Mallá (14 July 1891 – 7 June 1973) was a Czech composer and pianist. She studied piano with Josef Jiránek at the Prague Conservatory, graduating in 1913 and later studied composition privately with Vítězslav Novák. She suspended her work as a composer during the communist years. Her works include didactic piano compositions, a sonatina and preludium for piano and about fifty songs. She died in Prague.

paragraph_text: Amédée Méreaux (full name Jean-Amédée Lefroid de Méreaux) (Paris, 17 September 1802 – Rouen, 25 April 1874) was a French musicologist, pianist, and composer. He was the author of "Les clavecinistes de 1637 à 1790", written from 1864 to 1867, which had essays on the composers it mentioned. His grandfather, Nicolas-Jean Lefroid de Méreaux (1745–1797), was a composer of operas and oratorios, while his father, Jean-Nicolas Lefroid de Méreaux, was an organist and pianist and was a composer of piano sonatas. He was a friend of Frédéric Chopin.

paragraph_text: Ludwig van Beethoven composed his Horn Sonata in F major, Op. 17 in 1800 for the virtuoso horn player Giovanni Punto. It was premiered with Punto as the soloist, accompanied on the piano by Beethoven himself in Vienna on April 18, 1800.

paragraph_text: 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.

paragraph_text: Madame Ravissa de Turin (b. late 18th century; died February 20, 1807) was an Italian singer and composer. She was from Turin, but apparently lived in Paris from 1778 until 1783. She published six sonatas for harpsichord in Paris in 1778, on which she was described as "Maîtresse de Clavecin et de Chant italien". A copy of the sonatas survived in the collection of Kaiser Franz II of Austria. In 1933 the manuscript was discovered in storage at Steiermärkischer Musikverein by musicologist Ernst Fritz Schmid, and is now housed at Osterreichische Nationalbibliothek in Vienna. In 1778 her work was described in the "Parisian Almanach Musical" as "bold modulations that the Italians love and our timorous composers do not dare to allow themselves."

paragraph_text: Sonata pian' e forte was written by Giovanni Gabrieli, an Italian composer and organist in 1597. This is the earliest known piece of music to call for specific brass instruments.

paragraph_text: The first Ferruccio Busoni International Piano Competition was organized by Cesare Nordio in 1949 to celebrate the 25th anniversary of the death of pianist and composer Ferruccio Busoni. Arturo Benedetti Michelangeli was a supporter of the competition and was part of the jury of the first competition. Alfred Brendel won the 4th prize in this competition. For a few years a piano composition competition took place together with the piano competition.

paragraph_text: Maria Rosa Coccia was born in Rome and studied with Sante Pesci. At the age of 13, Coccia composed six sonatas for harpsichord and the oratorio "Daniello", which was performed the same year in the Oratory S. Filippo Neri, in defiance of a tradition that women were not allowed to attend the event.

paragraph_text: The Rosary Sonatas ("Rosenkranzsonaten", also known as the Mystery Sonatas or Copper-Engraving Sonatas) by Heinrich Ignaz Franz Biber are a collection of 15 short sonatas for violin and continuo, with a final passacaglia for solo violin. Each has a title related to the Christian Rosary devotion practice and possibly to the Feast of the Guardian Angels.

paragraph_text: Frank Domínguez (born Francisco Manuel Ramón Dionisio Domínguez y Radeón on 9 October 1927 in Matanzas, Cuba – died 29 October 2014 in Mexico) was a Cuban composer and pianist of the "filin" movement. Born in Matanzas, he began to play piano at 8.

Question: Who is the father of the composer of Piano Sonata No. 9?
Answer: Leopold Mozart