Kochel / Germany
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., or 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 K. 626; Köchel's original catalogue has been revised twice; catalogue numbers from the sixth edition are indicated either by parentheses or by superscript: K. 49 or K.6 47d.