First post so I'm not sure if this has been covered yet, but I recently went to the opera (my GF's work gave us free tickets, I don't normally live that lifestyle) and we saw "La Traviata." One of the songs from the show was stuck in my head for days and I couldn't figure out where I knew it from then I realized it was from the Italian wedding scene in GFI.
It briefly plays when Appolonia is passing out the marshmallows (?) to the people at the wedding. Also if anyone has more insight on the Italian wedding rituals it'd be interesting to know exactly what she was passing out.
