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The Functional Requirements for Bibliographic Records (FRBR)'s hierarchical system defines families of bibliographic relationship between records and collocates them better than most extant bibliographic systems. Certain library materials (especially audio-visual formats) pose notable challenges to search and retrieval; the first benefits of a FRBRized system would be felt in music libraries, but research already has proven its advantages for fine arts, theology, and literature--the bulk of the non-science, technology, and mathematics collections. This report will summarize the benefits of FRBR to next-generation library catalogs and OPACs, and will review the handful of ILS and catalog systems currently operating with its theoretical structure. [ABSTRACT FROM AUTHOR]