When I saw Yes back in the 70s the last few minutes of this was played through the PA and just as it ended the lights came up and they launched right into Siberian Khatru. Goosebump moment for sure.
Been one of my fave classical pieces ever since.
P.S. The concert was in the round and I had a 7th row aisle seat. At one point me and Howe made direct eye contact and I gave him the #1 sign and he broke into a big smile.
P.S.S. During the encore of Roundabout he jumped from the top tier of the stage to break into the guitar solo and ended up yanking out his guitar cord in the process. He recovered in a blink and laughed at himself along with the rest of the band.