When reading Canopus in Argos: Archives, I discovered that two of the books (The Marriages Between Zones Three, Four, and Five and The Making of the Representative for Planet 8) had been turned into operas by Philip Glass. Unfortunately, none of the music has been released on a commercial recording, leaving this libretto of the second opera the closest I can get. Reading an opera is obviously no substitute for seeing one, but I liked this-- I thought it improved on some of the flaws of the novel, driving home some points the book is a little too elliptical about. (Also: it has actual characters.) I've got no idea how it actually would have been rendered on stage, though.