I believe it's called the Libretto.
The text of an opera is called the libretto and the writer is called a librettist.
opera
lorgnette
Linetta or Libretta
The opera house where most of the action is set in Phantom of the Opera is called the Palais Garnier. It was built in 1871 and is in Paris, France. Unlike in the musical, the opera house is still open today.
A narration within a narration is called a "nested narration" or a "frame narrative". This is a storytelling technique where one story is told within another story.
It is still called 1st person narration
They are called "opera glasses"
The lyrics of an opera are called the "libretto."
In almost every language it is called opera.
the sydney opera house is called the sydney opera house because opera is song in the building and because of its great views.
Opera buffa
It was called the Opera Populaire in the 1880's.
A quick search does not reveal such an opera.
Yes there was a soap opera called soap in the sixties.
The text of an opera is called the libretto and the writer is called a librettist.
There is no name for it. However the ending of an opera is usually referred to as the finale of the opera.