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
19th-century London one of the most ambitious public works projects undertaken in 19th century London. It transformed the appearance of the riverside between Chelsea and Blackfriars and consists of three different sections: the Victoria Embankment, constructed between 1864 and 1870, the Albert Embankment (1866-70), and the Chelsea Embankment (1871-74). The embankments protected low lying areas along the Thames from flooding, provided a more attractive prospect of the river compared to the mudflats and boatyards which abounded previously, and created prime reclaimed land for development. The Victoria Embankment was the most ambitious: it concealed a massive interceptor sewage tunnel, which channeled waste from