Omni is the library's online catalogue and includes records for both the physical and electronic collections. Article citations are drawn from periodical indexes and fulltext databases and interfiled with other resources in the search results so once you have performed your search it is best to begin narrowing down the results by choosing the available facets in the left hand column.
The Four R's of International Music Research
RISM: Répertoire International des Sources Musicales (International Inventory of Musical Sources). An index of handwritten or printed music held in libraries and archives, including writings about music, including librettos and vocal and instrumental instruction works.
RIdIM: Répertoire International d'Iconographie Musicale. An international index of visual sources of music held in libraries and archives.
RILM: Répertoire International de Littérature Musicale (York subscription). An international index to journals, books, e-publications, dissertations, and conference proceedings.
RIPM: Répertoire International de la Presse Musicale (Retrospective Index to Music Periodicals). York does not subscribe to this but there is historical information available about numerous foreign language periodicals (journals, etc.) dealing with music from 1766 to 1966.