Collecting Operas on Vintage Postcards
- An illustrated introduction to collecting early 20th century European historical opera postcards.
- http://www.luckymojo.com/operacards.html

Historic Opera
- Archived images of historic opera singers, composers, and set designs.
- http://www.historicopera.com/

Timeline of American Opera
- A chronology of important dates in the history of American opera.
- http://www.hapka.com/usopera/timeline.html

The Rise of Light Opera
- A history of the development of the comic opera.
- http://www.imagi-nation.com/moonstruck/spectop001.html

Tenorland
- Historical information on famous tenors from the past.
- http://tenorland.com/

Chinese Opera
- A brief history.
- http://www.hamilton.edu/academics/Asian/OpProg2.html

Opera Timeline
- A chronology of important dates in the history of opera.
- http://www.pbs.org/wnet/threetenors/time-content.html

Metropolitan Opera History
- A history of one of the world's leading opera companies.
- http://www.metopera.org/history/

The Legacy of the Diva
- Opera's recorded legacy. Articles and surveys of aria recordings especially from the coloratura repertoire.
- http://www.divalegacy.com/