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
Peter K. Moran became popular as a song composer, with "The Carrier Pigeon" (1822; also arranged as a rondo for piano, c.1825) that had many editions. Other well-known pieces by him (for harp or piano) include his variations on "Kinlock of Kinlock" (1825), "Swiss Waltz" (c.1810), "Stantz Waltz" (c.1817), and "Suabian Air" (c.1817). He also arranged many traditional airs, and religious works by Handel and others. Many of Moran's works were still listed as for sale in the "Board of Music Trade Catalogue" in 1870. Piano solo Piano 4-hands "Harp or piano-forte" Songs Peter K. Moran Peter K. Moran [P.K. Moran] (30 June