http://www.musikverein.at/suche/sucheErweitert.asp
Wien, Musikverein Wien

http://81.75.233.46:8080/fenice/GladReq/index.jsp
Venice, Teatro La Fenice 

http://www.teatroregio.torino.it/archivio/opera.htm
Torino, Teatro Regio 

http://www.operaroma.it/produzio.htm
Rome, Opera Roma - work in progress

http://www.ravennafestival.org/db_cerca.php
Ravenna Festival, 1990 – today (doesn’t list roles)

http://www.rossinioperafestival.it/modules.php?op=modload&name=News&file=index&catid=&topic=2
Pesaro, Rossini Festival

http://biblioteche2.comune.parma.it/biblioteche/archivio/cronologia/
Archive, Teatro Regio Parma - hard to find and only until 1989  

http://www.carlofelice.it/ricerca.asp?parentZ=60&itemID=60&imgPath1=archivio&imgPath2=
Genova, Teatro Carlo Felice

(The archive of Teatro alla Scala Milano is offline since more than a year)

http://www.dno.nl/index.php?m=archive
Amsterdam, De Nederlandse Opera - starting with 2000, may extend

http://www.operazuid.nl/navigatie/uk_index.html
Maastricht, Opera Zuid

http://www.teatro-real.com/
Madrid, Teatro Real - starting with 2002, may extend, click on Temporada

http://www.abao.org/historico.htm
OLBE ABAO, Bilbao

http://www.festivalperalada.com/ing/ottemp.asp
Festival Castell de Peralada

http://www.losangelesopera.org/company/preformer_list.asp?type=Season
Los Angeles, LA Opera

http://66.187.153.86/archives/frame.htm
New York, Metropolitan Opera House

http://www.lyricopera.org/about/performanceArchive.asp
Chicago, Lyric Opera

http://archive.sfopera.com/qry1operalist.asp
San Francisco Opera Performance Archive

http://www.oony.org/history.htm#history1
Opera Orchestra of New York

http://www.sdopera.com/company/index.html?frame=perfhistory.html
San Diego Opera

http://www.verdisdisco.de
Verdi

http://www.wagnermania.com/bayreuth/
Bayreuth date base

http://www.desmeisterswerk.ch/
Wagner

http://www.wagnerdiscography.com/
Wagner

http://www.mozarteum.at/03_Wissenschaft/03_Wissenschaft_TonFilm.asp?SID=23010427944551
Mozart

http://www.karajan.org
Herbert von Karajan

http://www.beverlysillsonline.com
Beverly Sills

http://FrankHamilton.org
Franco Corelli, Giuseppe di Stefano, Maria Callas, Tito Gobbi, Metropolitan Opera, Philadelphia Opera

http://www.andreas-praefcke.de/wunderlich/discography/discogr.htm
Fritz Wunderlich

http://www.zarzuela.net/index.htm
Zarzuela recordings

http://www.operaclass.com/index.asp?idioma=en
Studio and commercial live recordings

http://www.euro-opera.de/
Broadcast schedule and past broadcasts with detailed cast information

http://www.operadis.info/
Database of opera recordings