(Scott Johnson) The parties have returned to Vienna to wrap up the imminent nuclear deal with Iran. Why not Munich? It would be more fitting, but Vienna signifies in its own way. John Lennon contributed the title song to Ringo Starr for Ringo's 1974 album Goodnight Vienna. As a result, I have come to understand that the phrase Goodnight Vienna is English slang for "it's all over." So "Goodnight Vienna" it is.
Source: Power Line