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As of 2018, the database currently contains a cross-index of data for over 42,000 opera and oratorio premieres.
Grove Music Online : 100 Operatic Premières Timeline
Grove's Timeline of 100 Operatic Premièresis not a comprehensive timeline but a chronological overview, representing all historical styles of opera and including all the major works.
Televised Opera and Musical Comedy Database
The Televised Opera and Musical Comedy Databaseat 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.