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Opera Seria and Opera Buffa
Opera buffa has comic elements, while opera is strictly dramatic.
Opera buffa rose to prominence in the late eighteenth century
Opera buffa was about real people. The music acompanying it was light and humerous.
Opera Buffa is a comedic opera.
Opera Seria is a serious opera.
One is "serious" (seria)or dramatic opera, while the other has "comic" touches (buffa) and is lighter in style.