• 68 Sound Recordings
• 64 Music Scores
• 31 Books
• 23 Videos, Slides, Films
• 2 Mixed Materials

• 34 Vinyl Records
• 19 Compact Discs
• 17 DVDs
• 1 Blu-ray Discs
• 1 VHS Videocassettes

• 126 Operas
• 8 Don Juan (Legendary character)
• 7 Mozart, Wolfgang Amadeus, 1756-1791
• 5 Da Ponte, Lorenzo, 1749-1838
• 3 Opera
• 2 Don Giovanni
• 2 Librettists
• 2 Man-woman relationships
• 2 Promptbooks
• 1 Beaumarchais, Pierre Augustin Caron de, 1732-1799
• 1 Così fan tutte
• 1 Juan, Don (Legendary character)
• 1 Librettos
• 1 Live sound recordings
• 1 Musical settings
• 1 Nozze di Figaro
• 1 Orchestral music
• 1 Sexual ethics
• 1 Songs (Low voice) with piano
• 1 Songs with orchestra
• 1 Tensons, Romance-language
• 1 Vocal music

• 175 Mozart, Wolfgang Amadeus, 1756-1791
• 25 Beaumarchais, Pierre Augustin Caron de, 1732-1799
• 23 Tams-Witmark/Wisconsin Collection
• 21 Wiener Philharmoniker
• 18 Konzertvereinigung Wiener Staatsopernchor
• 12 Schwarzkopf, Elisabeth
• 9 Böhm, Karl, 1894-1981
• 8 Te Kanawa, Kiri
• 7 Berry, Walter
• 7 Davis, Colin, 1927-2013
• 7 Della Casa, Lisa
• 7 Fischer-Dieskau, Dietrich, 1925-2012
• 7 Philharmonia Chorus (London, England)
• 7 Philharmonia Orchestra (London, England)
• 7 Siepi, Cesare
• 6 Ganzarolli, Wladimiro
• 6 Royal Opera House (London, England)
• 5 Cotrubas, Ileana
• 5 David Lewis Crosby Collection
• 5 Deutsche Grammophon (Firm)
• 5 Finley, Gerald, 1960-
• 5 Freni, Mirella, 1935-2020
• 5 Glyndebourne Festival Chorus
• 5 Karajan, Herbert von

• 45 English
• 36 German
• 6 French
• 1 Unknown

• 1 New York
• 1 New York (State)

• 62 Operas
• 44 Vocal scores with piano
• 28 Librettos
• 20 Scores
• 17 Opera films
• 11 Drama
• 3 Excerpts
• 2 Sound recordings
• 1 Adaptations
• 1 Biography
• 1 Facsimiles
• 1 Manuscripts
• 1 Musical films
• 1 Nonfiction films
• 1 Video recordings
• 1 Vocal scores
• 1 librettos (documents for music)

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