Résumé
In this paper, we introduce OVERTURE-a web application allowing to explore the interlinked catalogs of major music libraries including the French National Library, Radio France and the Philhar-monie de Paris. We have first developed the DOREMUS ontology which is an extension of the well-known FRBRoo model for describing works and expressions as well as the creation process. We have implemented a so-called marc2rdf tool allowing for the conversion and linking of bibliographical entries about music works, interpretations and expressions from their original MARC-format to RDF following this DOREMUS on-tology. We present an exploratory search engine prototype that enables to browse through the reconciled collection of bibliographical records of classical music and to highlight the various interpretations of a work, its derivative, its performance casting as well as other rich metadata. 1 From Music Metadata to Linked RDF Graphs The DOREMUS project 1 develops methods to describe, publish, connect and contextualize music catalogs on the web of data. Our focus is on the description of classical and traditional musical works as well as their interpretations (events) [1]. We rely therefore on the FRBRoo model, which combines the strength of the FRBR practices in distinguishing a work from its interpretation and derivatives and the CIDOC-CRM model that emphasizes the role of events for modeling the process of creation of creative works. We extend FRBRoo by adding classes and properties specific to the music domain (e.g. for representing the intended casting for interpreting a work). The research challenges we are tackling are related to the population of this rich ontological model from raw library metadata and on its visualization that should enable users to search for classical music but also see influencers and derivative works, or the many interpretations of a famous work. Data Conversion. The data collected from the BnF and the Philharmonie de Paris (PP) describing music works are represented in the MARC format (UNI-1 http://www.doremus.org/)