There are numerous kinds, but the basic types are - Grand Opera
Comic Opera Serious Opera Opera Semiseria Opera Cornique Opera
Verismo Singspiel Operetta Chinese opera
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Amongst numerous opera genres are - Ballad opera Chamber opera
Comic opera Comédie en vaudeville Grand Opera Masque Opera buffa
Opera semiseria Opera seria Operetta Opéra bouffe Opéra bouffon
Opéra comique Opéra féerie Opéra-ballet Rescue opera Romantische
Opera Savoy opera Singspiel Tragédie en musique Verismo
Zarzuela
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The opera populaire is the opera house that is in the
book/play/movie 'Phantom of the Opera'
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Assuming you mean "opera buffa" then the definition would be a comedic opera, as opposed to an "opera seria," meaning "serious opera."