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
K+S Poland, Portugal, Russia, Spain, Sweden and Switzerland in Europe, The Bahamas, Canada and the US in North America, Brazil, Chile and Peru in South America, China, India and Singapore in Asia, and South Africa in Africa. The K+S Group has three divisions, which are strategically, technically and economically closely linked. They are supported by service units and holding functions of the K+S AG K+S K+S AG (formerly" Kali und Salz GmbH") is a German chemical company headquartered in Kassel. The company is Europe’s largest supplier of potash for use in fertilizer and, after the acquisition of Morton Salt, the world's