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General Music Dictionaries & Encyclopedias with Solid Opera Coverage
Oxford Music Online
Provides entries on opera history and development, genres, specific operas, composers, librettists, producers, staging, opera houses and more.
Opera Dictionaries, Guides & Catalogs
General Surveys & Overviews
"Over 1200 arias with selections from more than 60 composers. Includes a database of the characters with a short description, the arias they sing, and the creator of the role (if known). Searchable by name, opera, language, composer, voice type, range, keyword, and whether there is a sound file, translation, or text available. There are also annotated links and a list of opera houses and companies."
Opening Night! Opera & Oratorio Premieres
Cross-index of data for over 38,000 opera and oratorio premieres, hosted by Stanford University Libraries.
Operabase – the reference for opera performances around the world. A database logging operatic activity worldwide since 1996, with over 470,000 performances. Public access includes current, past, and announced future seasons.