An interactive visualization of music history. It provides a genealogy of popular music genres including the relationships and influences between genres.

Explore music, theater, and dance at the Library of Congress.

Historical sheet music from the archives of multiple universities.

A 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.

Online collection of mostly 19th- and early 20th-century musical scores by women composers.

This 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.

Allows you to search the details of over 37,000 opera performances.

Reviews, librettists, composers and more.

The National Service Organization for Opera.

Focus on Africa, North and South America and African Diaspora music. Includes recordings.