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The Black Music History LibraryThis site provides access to a great collection of materials, including articles, books, documentaries, radio broadcasts, and podcasts.
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MusicmapAn interactive visualization of music history. It provides a genealogy of popular music genres including the relationships and influences between genres.
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Performing Arts EncyclopediaExplore music, theater, and dance at the Library of Congress.
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Sheet Music ConsortiumHistorical sheet music from the archives of multiple universities.
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TunefindA searchable, user-driven catalog of music featured in television, movies, and video games. Browse or search the site by TV show, movie, game, or trending music.
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Women Composers CollectionOnline collection of mostly 19th- and early 20th-century musical scores by women composers.
Americana, Country & Folk
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Smithsonian Folkways RecordingsThis site is considered "a cross between a record label and a museum and a time capsule for the history of music." Users can browse for recordings by genre, geography, artist, and label or search. Includes playlists, videos, podcasts, and articles.
Jazz
Opera
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OperabaseAllows you to search the details of over 37,000 opera performances.
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OperaGlassReviews, librettists, composers and more.
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OPERA AmericaThe National Service Organization for Opera.
World
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Global Music ArchiveFocus on Africa, North and South America and African Diaspora music. Includes recordings.