The Köchel-Verzeichnis is a complete, chronological catalogue of compositions by Wolfgang Amadeus Mozart, which was originally created by Ludwig von Köchel. It is abbreviated K. or KV. For example, Mozart's Requiem in D minor was, according to Köchel's counting, the 626th piece Mozart composed. Thus, the piece is designated K. 626 or KV 626. Köchel catalogue numbers are not only an attempt to establish a chronology of Mozart's works, but also provide a helpful shorthand to refer to them.
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