This paper follows an analytical and critical line of reasoning concerning indexing and retrieval of music in Swedish public libraries. The focus of the discussion is based on the terms included in the subject heading list of the Swedish Classification System. The empirical study is performed in the context of online catalogues in the public libraries of Örebro and Gävle. The theoretical background relies on the indexing theory of Professor Frederick W. Lancaster. An issue being discussed is in what extent the subject headings represent the music recordings in a pertinent way. One of the conclusions are that due to the lack of practicing the principle of specificity there are terms that have not been used in indexing. As a result of this and other problems I belive that the controlled vocabulary is in need of an update, which according to my opinion should include adding new terms as well as term deletion.