| Opera Companies | |
| West Coast | United States |
| San Francisco Opera | New York Metropolitan Opera |
| San Diego Opera | New York City Opera |
| West Bay Opera | Kansas City Opera |
| Los Angeles Music Center Opera | Houston Grand Opera |
| Europe/Australia | Santa Fe Opera |
| Royal Opera House-Covent Garden | Arizona Opera |
| La Scala | Austin Lyric Opera |
| Vienna State Opera | |
| Opera Links | |
| Opera Link Sites | |
| The Opera Schedule Server | |
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| Opera America | Metropolitan Opera--Education |
| National Association of Teachers of Singing | Texaco Met Broadcasts |
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| Bel Canto | Opera News |
| VOCALIST: the International Discussion List for Singing Professionals and Amateurs | |
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| The Lied and Song Texts Page | |
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| TenorLand | Cecilia Bartoli |