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Line 32: [[:Category:Operas by composer]] ;Genre [[:Category:Operas by genre]] (which should be plural and in the original language used in standard reference books to avoid confusion). For the purposes of Wikipedia (and indeed other encyclopedias such as '[[Grove]]), operettas are considered a subcategory of operas, so, for example, ''[[The Merry Widow]]'' is in [[:Category:Operas]] as well as [[:Category:Operettas]]. ;Language: [[:Category:Operas by language]] ;Year of premiere [[:Category:Operas by year]] ===Further categories=== Other categories include [[:Category:Operas by setting\|Operas by setting]]; [[:Category:Operas by world premiere ___location\|Operas by world premiere ___location]]; [[:Category:One-act operas\|One-act operas]]; [[:Category:Unfinished operas\|Unfinished operas ]]; [[:Category:Lost operas\|Lost operas]]; [[:Category:Operas by source\|Operas by source]] (for operas whose libretti are based on plays, novels, films, etc.)

Wikipedia:WikiProject Opera/Category guidelines: Difference between revisions