Köchel catalogue son's earlier works; Mozart's catalogue of his own compositions (begun in February 1784 with K. 449) allows relatively precise dating of many of his later works. The catalogue included the opening bars of each piece, known as an incipit. Köchel divided the corpus into a main chronology of 626 works, and five appendices ("" in German, abbreviated to "Anh.") The appendices (Anh. I-V) included: Since Köchel published his original catalogue in 1863 (now referred to as K), the dating of Mozart's compositions has been subject to constant revision. Many more pieces have since been found, re-dated, re-attributed and re-numbered, requiring
Austrian Americans some 40,000 Austrians entered the United States. Since the 1960s, however, Austrian immigration has been negligible, mostly because Austria is now a developed nation, where poverty and political oppression are scarce. According to the 1990 U.S. census, 948,558 people claimed be of Austrian descent (only 0.4 percent of the total population). In the 19th century, a total of 4.2 million Austrians had immigrated to the United States. Austrian immigrants adapted quickly to American society because the Austrian Empire had also been a melting pot of many cultures and languages. On the other hand, despite the rejection that Austrians feel toward