Beethoven's musical style
The compositions that Beethoven wrote in his formative period can be generally characterized by the composer's efforts to master the predominant classical language of the period. His works from this period can be subdivided into two, based on the composer's residence. First, various juvenalia, written when the adolescent Beethoven was in residence in Bonn and heavily indebted to the works of contemporaries, especially Mozart and his teacher, Christian Gottlob Neefe. These early efforts can be seen in a set of three piano sonatas and piano quartets (WoO 36) that Beethoven wrote before 1792. The Quartets, for instance, are each specifically modelled after three Violin sonatas Mozart published in 1781 – K 296, 379 and 380 – and Beethoven would later draw upon this familiarity in the composition of several of his own Violin Sonatas.
Ludwig van Beethoven
In May 1799, he taught piano to the daughters of Hungarian Countess Anna Brunsvik. During this time, he fell in love with the younger daughter Josephine who has therefore been identified as one of the more likely candidates for the addressee of his letter to the "Immortal Beloved" (in 1812). Shortly after these lessons, Josephine was married to Count Josef Deym. Beethoven was a regular visitor at their house, continuing to teach Josephine, and playing at parties and concerts. Her marriage was by all accounts happy (despite initial financial problems), and the couple had four children. Her relationship with Beethoven intensified after Deym died suddenly in 1804.
He also had a few other students. From 1801 to 1805, he tutored Ferdinand Ries, who went on to become a composer and later wrote "Beethoven remembered", a book about their encounters. The young Carl Czerny studied with Beethoven from 1801 to 1803. Czerny went on to become a renowned music teacher himself, instructing Franz Liszt, and on 11 February 1812 gave the Vienna premiere of Beethoven's fifth piano concerto (the "Emperor").