This is from a live performance of Bohème at La Scala in 1979. The radiant Ileana Cotrubas is Mimi; the conductor is mad genius Carlos Kleiber. Mimi sings, "Addio"; Rodolfo whispers in disbelief, "Che? vai?" (What -- you really are leaving?) Pavarotti's expression is even more real, more nuanced than the one I described in the Karajan recording. Immediately following this scene is the famous quartet, perhaps the most poignant scene in all of opera. I'm about to post it.