Mozart's Twelfth Mass, K. Anh. 232 Mozart's Twelfth Mass, K. Anh. 232 Mozart's Twelfth Mass, once a top seller among the liturgical compositions published by Vincent Novello in the 19th century, is a work no longer attributed to Wolfgang Amadeus Mozart. Köchel rejected the attribution to Mozart in the Anhang (appendix) of the first edition of his catalogue of Mozart's works, there listed as K. Anh. 232, and in later editions as K. Anh. C1.04. The mass was published in 1819 as No. 12 in Novello's series of masses by Mozart, which is the origin of its name. Simrock was the first to publish the mass
Austrian National Library also successfully introduced the card index. This facilitated the continuous updating of the inventory. After the Holy Roman Empire was dissolved by Napoleon and the Austrian Empire proclaimed in its place, the library was again reorganized. Under custodian Paul Strattmann, the library received a program for the first time which described its order; the library gained a three-way viewpoint: The collection politics of the Imperial Library separated at the beginning the 19th century appreciably due to the requirements of the representation and its attention to scientific works. The multinational condition of the Austrian Empire brought with itself that, not only