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 (composer) K (composer) Krishna Kumar, better known by his stage name K is an Indian music composer working primarily in films and documentaries. K was born in Nagapattinam, Tamil Nadu. When he was four months old, his parents moved to Chennai. He did his schooling at Padma Seshadri Bala Bhavan in Chennai, where he took lessons in playing the keyboard. He quickly progressed and finished Grade 8 certificate exams in music with the Trinity College of Music, London. K graduated in Genetic Engineering (B. Tech) from SRM University, Chennai. His musical talent found an outlet when he joined his first rock