performing organizations

Kitka: one of the Bulgaria's premiere women's vocal ensembles
Shepherds Hey Country Dance Band: Country Dance & Ceilidh Band in Yorkshire, England

Arizona Opera
Beijing Opera: http://www.geocities.com/Vienna/Opera/8692/index0.html; http://www.chinapage.com/beijing-opera.html (some sound files)
Chicago Lyric Opera
L.A. Opera
Metropolitan Opera
Minnesota Opera
New York City Opera
Polish National Opera
Santa Fe Opera
La Scala
Opera Theatre of Saint Louis
San Francisco Opera
The Washington Opera
Coordinated Opera Resource Pages: Opera Houses, by City: These pages have been put together to simplify the task of finding opera resources on the net by providing a co-ordinated index. Includes links to biographies, synopses, libretti, discographies etc., a list of 278 operas ordered by title, a chronological timelines of composers/works, links to the official and unofficial websites of Opera houses and festivals, and links to mailing lists and newsgroups.
Operabase: A powerful search tool allows you to search the opera schedules by any combination of date, composer, title, location. Search the Operabase schedules for a specified Singer/Role, Conductor or Producer. Database of 400 opera houses and festivals. Find opera houses by name/address, from an A-Z index or using the mouse-sensitive maps.
Operaglass: a Stanford University site provides links to libretti, source texts, performance histories, synopses, and discographies.

Orchestras: William and Gayle Cook Music Library Indiana University School of Music Worldwide Internet Music Resources