Just saw Yes and Styx last night:
both bands were in ridiculous top form. But Yes really stole the show. They jammed another good 4 minutes into Yours is No Disgrace with Howe's solo, they played And You And I, which was so musically rich that it was almost a surreal experience, they were completely tight on Tempus Fugit, they played the new song to a standing O, and Starship Trooper was an extravaganza, featuring Mr. Geoff Downes on Keytar rocking out with Howe, Squire, and David with an acoustic slung over his shoulder. Then of course, Roundabout came at the end, wrapping it all up with one of the best basslines of all time. I couldn't believe my eyes, though, at how much energy they all played with. Squire attacked the bass like it was a box of a dozen donuts, Howe was a freak of nature on guitar, and David had the smooth delivery of Horn with the soaring high notes of anderson, plus a Canadian accent that made his voice unique all going for him. I couldn't believe how tight their vocal harmonies were, too (same goes for Styx, but especially with Yes, whose harmonies are a bit more complex). And, the mix was excellent, I heard the guitar, drums, keys, sweet ric bass, and Benoit's vocals all in perfect balance.
Styx was all energy on that stage as well, with Shaw, Gowen, and JY all pulling out all the stops. These guys were still rocking just like on the albums. Probably the most accurate-to-recording band I've ever heard, honestly. Personal highlights were "Crystal Ball", "Man In the Wilderness", and "Come Sail Away". And we even got a surprise visit from Chuck Panazzo. Oh, and lets not forget what monster guitarists JY and Tommy both are. My only complaints were a lack of jamming on their part, and a bass tone that really blended into the mix, moreso than I've known them to use. But otherwise Styx was almost as excellent as Yes.