Other meanings of Köchel catalogue
Music reference
The Köchel catalogue is the chronological catalogue of Wolfgang Amadeus Mozart’s compositions, identified by the abbreviation “K.” or “KV” followed by a number. First published in 1862 by Ludwig von Köchel, it remains the standard numbering system for Mozart’s works, although later scholarship has revised many dates, attributions, and entries.1
The catalogue provides a practical identity system for Mozart’s compositions while presenting them in an approximate chronological order. Ludwig von Köchel arranged instrumental and vocal works together in a single sequence, assigning numbers from K. 1 to K. 626; the numbering is not a count of every surviving musical source or fragment.1
“K.” derives from Köchel’s name, while “KV” is the German abbreviation for Köchel-Verzeichnis, meaning “Köchel catalogue.” Both forms refer to the same numbering tradition, though publishers, performers, and scholars often favor one convention according to language and editorial practice. The catalogue covers symphonies, concertos, chamber music, piano works, sacred music, operas, songs, and unfinished pieces.
The numbers are catalogue identifiers rather than opus numbers. Unlike an opus sequence, which may reflect a publisher’s release decisions, the Köchel system attempts to represent Mozart’s compositional chronology and therefore gives listeners a quick way to place a work within his development.
The original catalogue was an important foundation, but subsequent research showed that some works had been misdated, misattributed, or placed in the wrong part of Mozart’s output. Köchel’s first edition relied on manuscripts, early printed music, documentary evidence, and stylistic judgment, while later editors gained access to additional sources and more precise analytical methods.2
Major revised editions appeared in 1905, 1937, 1961, and 1964, with the 1964 edition prepared by Alfred Einstein, Franz Giegling, Alexander Weinmann, and Gerd Sievers. Revised numbers are commonly shown with additions such as “K. 314/285d,” where the original number and a later catalogue placement are given together. A work can therefore have a familiar old number and a more historically defensible new position without there being two separate compositions.
Modern catalogues distinguish autograph manuscripts, copies, fragments, arrangements, doubtful attributions, and lost works more carefully than the earliest edition. The numbering nevertheless remains stable enough that performers and scholars generally preserve traditional references.
The Köchel catalogue functions as the everyday indexing language for Mozart’s music. Concert programs, recording titles, scholarly editions, library records, and thematic studies routinely identify compositions by their K. numbers alongside titles and musical genres.3
Numbers can also convey broad chronology. Early works such as the first symphonies occupy the lower range, while mature compositions—including the Symphony No. 40 in G minor (K. 550), Don Giovanni (K. 527), and the Clarinet Concerto (K. 622)—appear later. This pattern is useful but not absolute: Mozart sometimes returned to earlier pieces, revised them, or completed works begun years before.
The catalogue is especially valuable because title-based identification can be ambiguous. “Piano concerto in A major,” for example, could describe more than one work, whereas K. 488 identifies a particular concerto. K. numbers also connect different languages and editions, making international research and performance coordination easier.
The catalogue includes more than Mozart’s completed masterpieces. It records fragments, sketches, arrangements, doubtful works, and compositions known only through documentary evidence, reflecting the uneven survival of eighteenth-century musical sources.
The final number, K. 626, belongs to the Requiem in D minor, which Mozart left unfinished at his death in 1791 and which was completed by other musicians, especially Franz Xaver Süssmayr. Its catalogue position does not mean that every musical passage in the familiar performing version was written by Mozart. Similar cautions apply to works once accepted as Mozart’s but later reassessed through source criticism.
Köchel was not only a cataloguer: he was an Austrian botanist, mineralogist, music writer, and collector. His work helped establish a model for composer catalogues, although later systems such as the Bach-Werke-Verzeichnis and Deutsch numbers for Schubert developed independently. The continuing revision of Mozart’s catalogue illustrates that musical numbering is an interpretive scholarly tool, not an immutable property of a composition.
Köchel numbers are conventional scholarly identifiers; revised editions may place the same work under different numbers or provide both original and revised references.
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