Ludwig Ritter von Köchel since undergone revisions. Mozart's works are often referred to by their K-numbers ("cf." opus number); for example, the "Jupiter" symphony, "Symphony No. 41" K. 551. Moreover, Köchel arranged Mozart's works into twenty-four categories, which were used by Breitkopf & Härtel when they published the first complete edition of Mozart's works from 1877 to 1910, a venture partly funded by Köchel. He also catalogued the works of Johann Fux. Ludwig Ritter von Köchel Ludwig Alois Friedrich Ritter von Köchel (; 14 January 1800 – 3 June 1877) was an Austrian musicologist, writer, composer, botanist and publisher. He is best known for
Dr K–Sextett Dr K–Sextett The Dr K–Sextett is a short, occasional composition for six instrumentalists, written in 1969 by Karlheinz Stockhausen and given the number 28 in his catalogue of works. The Sextet was composed as the result of a request made to eleven composers in January 1969 by the London office of Universal Edition for short pieces of music to celebrate the 80th birthday of Dr. Alfred Kalmus, who had been Universal's London director since 1936. All of the pieces were scored for performance by members of the Pierrot Players . Collectively titled "A Garland for Dr. K.", the eleven works