Here is the New York Times review of the Merry Widow, televised to a theatre near you today.
My mother had a record of this opera and played it many times. I know one of the songs so well that when Wyona hummed it over the phone to me yesterday the title of the song came to me: Delia.
I was amused to read in the newspaper review that the correct name of the song is Vilja.
Oh well, I was close.