Köchel catalogue Köchel catalogue The Köchel catalogue () is a chronological catalogue of compositions by Wolfgang Amadeus Mozart, originally created by Ludwig von Köchel, in which the entries are abbreviated "K." and "KV". The numbers of the Köchel catalogue reflect the continuing establishment of a complete chronology of Mozart's works, and provide a shorthand reference to the compositions. According to Köchel's counting, "Requiem in D minor" is the 626th piece Mozart composed, thus is designated either "K. 626" or "KV 626"; however, his original catalogue (1862) of Mozart has been twice revised, and some works have had three KV. numbers, e.g. Mozart's
John Field (composer) were influenced by these works, which are particularly notable for their central movements, frequently nocturne-like. Some of the less known works were also historically important: particularly the piano fantasies, in which Field pioneered the Romantic large scale episodic structure. None of his piano sonatas, and only two of his 7 piano concertos, have a formal slow movement. In performance, Field would interpolate an existing nocturne in a related key or improvise one. This list is arranged according to Hopkinson numbers, introduced in the 1961 catalogue by Cecil Hopkinson. Many of these works were arranged for other instruments and (or) revised