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- Opera + German influences
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- Opera + Production and direction + History -- 21st century
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- Opera + Scholarships, fellowships, etc -- United States -- Periodicals
- Opera + Social aspects -- France
- Opera + Social aspects
- Opera + Analysis, appreciation
- Opera + Production and direction -- Fiction
- Opera + Vocational guidance
- Opera + Russian influences
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- Opera + Political aspects
- Opera + Interpretation (Phrasing, dynamics, etc.)
- Opera + Production and direction
- Opera + Philosophy and aesthetics
- Opera + Political aspects + History -- 19th century
- Opera + Political aspects + History -- 20th century
- Opera + Production and direction -- Juvenile fiction
- Opera + Production and direction -- Drama
- Opera + Performances
- Opera + Production and direction -- United States
- Opera + Stage-setting and scenery -- Pictorial works
- Opera + Historia
- Opera + Social aspects -- Italy
- Opera + German influences
- Opera + Political aspects + History