I am so truly sorry I missed this one. I can only imagine Gates of Delirium live, not to mention Sound Chaser. I was unable to attend because I was only 16 and living a sheltered life. My folks strictly forbade me from entering the sinful surroundings of an arena rock concert, especially if the performers were British!
I was fortunate enough to see Yes the next time they came through Salt Lake for the "Solos" Tour in 1976 but this particular concert appearance should have been mine.