Every opera lover will give you 30 different answers to this
question.
If you want to find your best 30 love duets in opera, choose a
singer and then find the CD with their best love duets, and you'll
be on your way. Then repeat until you reach 30 or your magic
number.
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Probably Sydeny Opera House :)
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An opera usually has, amongst others - An overture, arias,
duets, trios, chorus, acts, scenes etc.
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An opera written by the french composer, Georges Bizet.