Verkfrågan-katalogisatörens huvudvärk. En studie av regelverket vid katalogisering av musiktryck med utgångspunkt i begreppet verk.
The aim of this thesis is to explore the concept of the work and the problems with the definition of it. The concept is an important starting-point when it comes to cataloguing musical works and creating uniform titles. Another aim is to find out other difficulties that are frequent in cataloguing printed music. In the theoretical part of this thesis Functional Requirements for Bibliographic Records FRBR and the Swedish cataloguing rules KRS are important tools. The FRBR-model and the four entities work, expression, manifestation and item are described. In KRS important rules for uniform titles and printed music are studied. In the empirical study concepts and theories are practically examined. Four interviews are made at The Music Library of Sweden Statens musikbibliotek and Bibliotekstjänst BTJ, and one interview is made via e-mail with Patrick Le Buf at Bibliothéque nationale de France. The discussions with the music cataloguers have made it possible to get answers to the questions of this study. The results of this thesis should not be seen as general conclusions. From the literature and the interviews I can state that the concept of the work is important when it comes to collocating musical works, but the definition of the concept is not clear. When you are cataloguing musical works and creating uniform titles it is important to establish conventions. I have also noticed that an obvious problem when cataloguing printed music is that a title page often is missing. Finally it is important to further investigate FRBR.