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- Operas -- To 1800 -- Librettos
- Operas -- Film and video adaptations
- Operas -- Excerpts -- Piano scores
- Operas -- Scores
- Operas -- Excerpts -- Juvenile sound recordings
- Operas -- Excerpts
- Operas -- Selections
- Operas -- Vocal scores with continuo
- Operas -- Excerpts, Arranged
- Operas -- Television adaptations
- Operas -- 20th century -- Analysis, appreciation
- Operas -- Stage guides
- Operas -- 19th century -- Excerpts
- Operas -- Stories, plots, etc
- Operas -- Histoires, intrigues, etc
- Operas -- Piano scores
- Operas -- Excerpt -- Scores
- Operas -- Germany -- 19th century -- Scores
- Operas -- Juvenile
- Operas -- 18th century
- Operas -- To 1800 -- Scores
- Operas -- Instrumental settings
- Operas -- Soviet Union -- Literary themes, motives
- Operas -- Excerpts, Arranged -- Scores
- Operas -- Excerpts -- Vocal scores with piano
- Operas
- Operas -- Vocal scores with piano
- Operas -- England -- London
- Operas -- 20th century -- Philosophy and aesthetics
- Operas -- Italy -- 20th century -- Librettos
- Operas -- Bibliography
- Operas -- Ukraine
- Operas -- 21st century -- Philosophy and aesthetics
- Operas -- Juvenile -- Vocal scores with piano
- Operas -- Italy
- Operas -- Juvenile fiction
- Operas -- Excerpts, Arranged -- Scores and parts
- Operas -- Excerpts, Arranged -- Piano scores
- Operas -- Excerpts -- Scores
- Operas -- China -- Beijing
- Operas -- Russia (Federation) -- 20th century -- History and criticism
- Operas -- 19th century
- Operas -- Librettos