Opus number developed other catalogue-number systems; among them the "Bach-Werke-Verzeichnis" (BWV-number), and the "Köchel-Verzeichnis" (K- and KV -numbers) with which are organised the works of Johann Sebastian Bach and Wolfgang Amadeus Mozart, respectively. In the classical period, the Latin word "opus" ("work", "labour") was used to identify, list, and catalogue a work of art. By the 15th and 16th centuries, the word "opus" was used by Italian composers to denote a specific musical composition, and by German composers for collections of music. In compositional practise, numbering musical works in chronological order dates from 17th century Italy, especially Venice. In common usage, the
Biamonti Catalogue there are some that Biamonti could not have known about, and so there is still no single catalog with all of Beethoven's compositions. Biamonti's numbers, in addition, are rarely used. Instead, WoO numbers are generally favoured. Biamonti Catalogue The Biamonti Catalogue is a catalogue of Ludwig van Beethoven's compositions published in 1968 by the ILTE of Turin. The original name of the work is "Catalogo cronologico e tematico di tutte le opere di Beethoven, comprese quelle inedite e gli abbozzi non utilizzati". Giovanni Biamonti tried to combine all pieces of the author, including all works approached in other catalogues (the