Hi gaperon
There have been clues to these (and others) on the other thread - no answers (well one actually) are given. Have a look at those, then get back if you need more pointers.
As you will see, I've not quite finished it.
Thanks, I've been looking at the other 30 comments & despite being an opera fan, my brain just can't get its way around this one. Think I might have to give up, have a siesta & see if inspiration comes later. Totally discouraged.