The Chicago Film Archives are preserving the hundreds and hundreds of films in Ruth Page's collection and are slowly putting them on line. This is a rehearsal film in which Seymour and Schaufuss are dancing with the Chicago Ballet in January 1978. A little over a year later the company would disband. They were dancing here in a good theater (the Lyric Opera) with a full orchestra. As it is a rehearsal, sometimes someone wouldn't always dance full out. The Madge is Freddie Franklin and Effie is a girl named Cynthia Ann Roses. (The film isn't labeled apart from the title but I happened to have seen the rehearsal).
If you look at it you need not to use Explorer, I was told it wouldn't work with that. Additionally the sound is low so put your speakers up as much as you can.