Answer:
As nouns the difference between singspiel and opera is that singspiel is (music|uncountable) an early german form of opera consisting of spoken dialogue interspersed with song while opera is (music) a theatrical work combining drama, music, song and sometimes dance.According to the 1908 edition of Grove's Dictionary of Music, the main distinction between opera and Singspiel is: " [Singspiel] by no means excludes occasional recitative in place of the spoken dialogue, but the moment the music helps to develop the dramatic denouement we have to do with Opera and not with Singspiel."
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