You know, I'm going to look for those operas, with subtitles, as I don't speak latin.
It's actually Italian, but that makes its understanding easier, if you speak Spanish, however there are some nous, pronouns and verbs that differs, but overall you cant get a pretty good idea of the things that go into these operas, whatever you find in you tube is the just the main acts of each opera, I dont know if the whole operas are up, but I'm pretty sure someone should have already upload them.
If you want to get an idea of each opera topic, here is a quick recap:
La Donna È Mobile -> The old love story about a miserable guy trying to win the heart of his beloved one.
Nessun dorma -> Homage to the night, I guess.
Il barbiere di Siviglia -> Remember that depreciable mare on
Boast Busters, well, change that mare for a Barber, the magic show for a shaving session with Celestia including some additional plot, and you get the idea.
And remember, Applejack and Rarity
slept together (canon).