Hosted at Stanford University Libraries, Opening Night! "is an attempt to assemble and make accessible in one place every opera and oratorio premiered through 1995."
As of 2018, the database currently contains a cross-index of data for over 42,000 opera and oratorio premieres.
The Televised Opera and Musical Comedy Database at Indiana University describes complete, abridged, and excerpted nationally and regionally distributed TV productions of operas, operettas, and musicals produced in the United States. The database is an on-going research project.
The National Negro Opera Company, the first African-American opera company in the United States, was founded in Pittsburgh, Pennsylvania in 1941, by Mary Cardwell Dawson. The collection contains materials and records related to the company and to Dawson. It includes correspondence, administrative and financial records, photographs, programs, promotional and publicity materials, scrapbooks, clippings, address books, notebooks, music, and books. In addition, the collection contains materials related to opera singer La Julia Rhea, who performed with the company, and Walter M. Dawson, Mary Cardwell Dawson's husband, who worked for the company.
The Royal Opera House's Collections Online Performance Database gives varying amounts of information about cast. It does provide links to other ROH collections for sets, designs, photographs, and more.