From McMenamins Edgefield Concerts' website:

An Evening with YES
Sunday, August 17, 2008
CANCELLED, due to illness
Aw crap. Laugh if you want, but after seeing the Joggers tear "Long Distance Runaround" a new one a few weeks back, I was looking forward to seeing the prog legends live.
yeslive.jpgTell me this doesn't look sweet.

An official press release from the band states:

Legendary rock band Yes announced that the group will unfortunately be canceling their 2008 40th Anniversary Tour. Said Jon Anderson, “In the wake of my recent respiratory attack, doctors have advised me to spend the coming months resting and recovering. Unfortunately, this means I won't be able to tour with Yes this summer as originally planned."
Leave your best "Owner of a Lonely Heart" joke in the comments!