Der Rosenkavalier
The Marschallin, Sophie and Octavian sing a beautiful trio (using some of the music from the song “Nein, nein, i’ trink kein Wein”).  Octavian is forgiven.  He is left alone with Sophie and they sing a duet together, then go off hand in hand.  She has left a handkerchief on the floor.  The little black pageboy picks it up and runs after them.