Yes apparently have a no-moonlighting rule. When they take to the high seas next month aboard the Cruise to the Edge, their latest Jon Anderson sound-alike, Jon Davison, will not be able to sing with his other band, Glass Hammer, who are also performing on board.

Glass Hammer's Steve Babb says, "We realize some of you will be disappointed that Jon Davison will not be fronting the band. I can only assure you that Jon and the other members immediately said ‘yes’ when asked to do the cruise, but Yes management said ‘no’!”

Davison joined Glass Hammer in 2009 and replaced the first Anderson sound-alike, Benoit David, in Yes last year. The cruise sets sail from Ft. Lauderdale, Florida on March 25th.