From YES' facebook site:
It’s with the heaviest of hearts and unbearable sadness that we must inform you of the passing of our dear friend and Yes co-founder, Chris Squire. Chris peacefully passed away last night in Phoenix Arizona. We will have more information for you soon.
Rest in Peace, Chris...
I'm absolutely gutted.
I'm a guitar player and will be devastated the day Steve Howe dies (he has been a massive influence on me as a musician), but this is probably worse. It is with the death of Chris Squire that we have reached the end of an era - the classic lineup of Yes will never play together again. 2004 was the swan song. link
^ And You And I from MSG 2004. They could barely finish the song because the audience's reaction. What a wonderful moment in music. I saw them a couple months after this - one of the last Yes shows with the classic lineup.