• 18 Music Library (Mills)

• 68 Sound Recordings
• 1 Maps, Atlases
• 1 Videos, Slides, Films

• 12 Vinyl Records
• 8 Compact Discs

• 47 Operas
• 1 Clytemnestra (Greek mythology)
• 1 Electra (Greek mythology)
• 1 Marches (Orchestra)
• 1 Masses
• 1 Perceval (Legendary character)
• 1 Suites (Flutes (2), trumpets (5), timpani)
• 1 Symphonies

• 45 Wagner, Richard, 1813-1883
• 27 Windgassen, Wolfgang
• 23 Hotter, Hans
• 19 Solti, Georg, 1912-1997
• 19 Wiener Philharmoniker
• 18 Knappertsbusch, Hans, 1888-1965
• 18 Nilsson, Birgit
• 15 London, George, 1920-1985
• 11 Bayreuther Festspiele
• 11 Böhme, Kurt, 1908-1989
• 10 Greindl, Josef
• 10 Kuen, Paul, 1910-1997
• 10 Stolze, Gerhard
• 9 Flagstad, Kirsten, 1895-1962
• 9 Frick, Gottlob, 1906-1994
• 9 Sutherland, Joan, 1926-2010
• 8 Malaniuk, Ira
• 8 Watson, Claire
• 7 Dalis, Irene
• 7 Fischer-Dieskau, Dietrich, 1925-2012
• 7 Höffgen, Marga
• 7 Svanholm, Set
• 7 Talvela, Martti
• 7 Thomas, Jess

• 64 German
• 3 Italian
• 2 Latin
• 1 English
• 1 Multiple languages

• 30 Operas
• 6 Excerpts
• 6 Live sound recordings
• 2 Drama
• 1 Internet videos
• 1 Librettos
• 1 Masses

Limit year range