"Yessongs" is basically a very poor film of a great band in a good concert.  If you are a Yes fan, you will probably want to view "Yessongs," especially if you never saw the band live.  I saw the band live about 5 years after this concert was filmed, and not much had changed.  More of a light show, more keyboards for Wakeman, more great tunes, but basically the show was unchanged.