numbersKöchel

The Köchel catalogue, often abbreviated as K or KV, is a chronological thematic catalogue of the compositions of Wolfgang Amadeus Mozart. Compiled by Ludwig von Köchel, a musicologist and composer himself, the first edition was published in 1862. Köchel aimed to list and classify all of Mozart's known works, assigning a unique number to each. This system has become the standard method for identifying and referencing Mozart's compositions.

The Köchel numbers are not strictly based on composition date, but rather on the order in which Köchel believed they were written. While the catalogue has undergone several revisions and updates by subsequent musicologists to incorporate new discoveries and correct inaccuracies, the original numbering scheme remains largely intact. For example, the Symphony No. 40 in G minor is universally known as Symphony No. 40, K. 550.

The Köchel catalogue is essential for Mozart scholars, performers, and enthusiasts. It provides a systematic way to study Mozart's output chronologically, trace the development of his musical style, and ensure clarity when discussing specific works. The catalogue includes symphonies, concertos, operas, chamber music, solo piano works, sacred music, and lieder, among other genres. Its enduring importance highlights Köchel's significant contribution to Mozart scholarship.