"Rodolphe Kreutzer (1766-1831) was a French violinist, teacher, conductor, and composer of forty French operas. He became one of the foremost violin virtuosi of his day, appearing as a soloist until 1810. He was a violin professor at the Paris Conservatoire from its foundation in 1795 until 1826. He was co-author of the Conservatoire's violin method with Pierre Rode and Pierre Baillot, and the three are considered the founding trinity of the French school of violin playing. For a time, Kreutzer was leader of the Paris Opera, and from 1817 he conducted there too. He is probably best known as the dedicatee of Beethoven's Violin Sonata No. 9 in A major, Op. 47 (1803), though he never played the work, declaring it unplayable and incomprehensible. Kreutzer made the acquaintance of Beethoven in 1798, when at Vienna in the service of the French ambassador, Jean-Baptiste Bernadotte (later King of Sweden and Norway). Beethoven originally dedicated the sonata to George Bridgetower, the violinist at its first performance, but after a quarrel he revised the dedication in favour of Kreutzer. Kreutzer was well known for his style of bowing, his splendid tone, and the clearness of his execution. His compositions include nineteen violin concertos and forty operas. His best known works, however, are the '42 studies or caprices', which are fundamental pedagogic studies." http://en.wikipedia.org/wiki/Rodolphe_Kreutzer