Piano Sonata No. 6 (Beethoven)
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.
Disma Fumagalli
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.
Frédéric Chopin
In his native Poland, in France, where he composed most of his works, and beyond, Chopin's music, his status as one of music's earliest superstars, his association (if only indirect) with political insurrection, his love life and his early death have made him, in the public consciousness, a leading symbol of the Romantic era. His works remain popular, and he has been the subject of numerous films and biographies of varying degrees of historical accuracy.
Seasons of Love
"Seasons of Love" is a song from the Broadway musical "Rent", written and composed by Jonathan Larson. The song starts with an ostinato piano motif, which provides the harmonic framework for the cast to sing "Five hundred twenty-five thousand, six hundred minutes" (the number of minutes in a common year [60 minutes × 24 hours × 365 days]). The main instruments used throughout the song are piano, vocals, guitar, organ, bass and drums.
Horn Sonata (Beethoven)
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.
Frédéric Chopin
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.
Structures (Boulez)
Structures I (1952) and Structures II (1961) are two related works for two pianos, composed by the French composer Pierre Boulez.
Piano Sonata No. 2 (Shostakovich)
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.
International Who's Who in Music
The International Who's Who in Music is a biographical dictionary and directory originally published by the International Biographical Centre located in Cambridge, England. It contains only biographies of persons living at the time of publication and includes composers, performers, writers, and some music librarians. The biographies included are solicited from the subjects themselves and generally include date and place of birth, contact information as well as biographical background and achievements.
Synval Silva
Synval Silva (Juiz de Fora, March 14, 1911 - Rio de Janeiro, April 14, 1994) was a singer and Brazilian composer. Its main successes were recorded by Carmen Miranda.
Jimmy Blythe
James Louis Blythe (May 20, 1901 – June 14, 1931) was an American jazz and boogie-woogie pianist and composer. Blythe is known to have recorded as many as 300 piano rolls, and his song "Chicago Stomp" is considered one of the earliest examples of boogie-woogie music to be recorded.
Florentina Mallá
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.
Piano Sonata No. 6 (Mozart)
Wolfgang Amadeus Mozart's Piano Sonata No. 6 in D major, K. 284 / 205b, (1775) is a sonata in three movements:
Johanna Senfter
Johanna Senfter was born and died in Oppenheim. From 1895 she studied composition under Iwan Knorr, violin under Adolf Rebner, piano under Karl Friedberg and organ at the Hoch Conservatory in Frankfurt am Main. This gave her a considerable amount of musical training when in 1908 she became a student of Max Reger in Leipzig. She composed nine symphonies, 26 orchestral works and concertos for piano, violin, viola, and cello. Senfter was a masterful composer of fugue. Altogether she left behind 134 works.
Amédée Méreaux
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.
Donald James Winslow
Donald James Winslow (1911 – 10 July 2010) was a professor at Boston University in Boston, United States who specialized in the subject of biography.
List of Dewey Decimal classes
920 Biography & genealogy 920 Biography, genealogy, insignia 921 - 928 This range is reserved as an optional location for biographies, which are shelved alphabetically by subject's last name. 929 Genealogy, names, insignia
Sonata pian' e forte
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.

Question: What is the main subject of biographies of the composer of Piano Sonata No. 14?
Answer: Wolfgang Amadeus Mozart