• Operabase
• Wikipedia general page on opera
• Opera Glass
• Opera magazine (UK)
• Opera News (U.S.)
• 220 Opera e-libretto and more: Collection Ulrich Voyer
• Libretto Index by H. Weber
• Mike Richter’s Home Page
• musicnotes.com
• SheetMusicPlus
• Indiana University: On-line Opera Scores
• EZTarcks: All Opera Music
• Amadeus Press web site

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Last updated: February 25, 2008