In those days the O'Keefe Centre was almost my second home - I've honestly lost track of the number of musicals, operas, ballets and plays I saw from its opening in1960 until I left Toronto in 1976 but certainly I recall these two gentlemen and in particular their take on Mozart.
In the comments on Youtube someone wrote that hearing Flanders and Swann's "Ill Wind" was their introduction to Mozart. I can't say that but they did introduce me to the Horn Concerti and one of the great recordings of the second half of the 20th century. In November 1953 Dennis Brain, Herbert von Karajan and the Philharmonia Orchestra recorded the four concerti in what are still considered definitive performances to this day. Here's the no. 4 that Flanders and Swann so freely - and amusingly - borrowed from.
October 15 -1815: Napoleon I of France begins his exile on Saint Helena in the Atlantic Ocean.