Ludwig van Beethoven (baptised 17 December 1770 – 26 March 1827) was a German composer, conductor, and pianist. Mentored during the Classical period, Beethoven's musical style was a key driver of the transition to Romantic music, and the expansion of popular forms such as the symphony and string quartet. His compositions have attracted casual and scholarly interest, and remain among the most performed in the world. Born in Bonn, Beethoven was a musical prodigy. He was initially taught intensively by his father, Johann van Beethoven, and later by Christian Gottlob Neefe. He found relief from a dysfunctional home life with the family of Helene von Breuning, whose children he loved, befriended, and taught piano. At age 21, he moved to Vienna, which subsequently became his base, and studied composition with Joseph Haydn. Beethoven gained a reputation as a virtuoso pianist, and was soon patronized by Karl Alois, Prince Lichnowsky for compositions, which resulted in his three Piano Trios, Op. 1, (the earliest works to which he accorded an opus number) in 1795. His Pathétique Sonata was composed in 1798. Around this time, Beethoven began experiencing symptoms of hearing loss. His career is divided into three periods. In the first, he composed in the classical style of Haydn and Wolfgang Amadeus Mozart. Beethoven's First Symphony premiered in 1800, and his first set of string quartets was published in 1801. The Moonlight Sonata, dedicated to his pupil Julie Guicciardi, is one of his most popular works. In the middle period (1802–1812), he developed a distinctive style. His Third (Eroica) and Fifth Symphonies premiered in 1805 and 1808, respectively. The former was unprecedented in scale and scope. His opera, Fidelio, premiered in 1805, and was later revised. His Violin Concerto appeared in 1806. His Razumovsky quartets were published in 1808. Other middle works include the Waldstein and Appassionata sonatas for piano, the Kreutzer sonata for violin and his Seventh Symphony. His Emperor piano concerto premiered in 1811, without the composer as soloist. His late period (1812–1827) included some of his most innovative works. His Missa solemnis and his final symphony, the Ninth, premiered in 1824. The latter was the first major example of a choral symphony. His Diabelli Variations and late piano sonatas, particularly the Hammerklavier, are summits of the keyboard literature. His late string quartets, including the Große Fuge, of 1825–1826, are considered pinnacles of the genre. After several months of illness, which left him bedridden, Beethoven died on 26 March 1827 at the age of 56.