DENVER (AP) -- The classic rock band Yes has canceled all concert dates through Feb. 24 because of unspecified medical reasons.

The band was scheduled to play Thursday night at Denver's Paramount Theatre.

Yes released a statement saying it is canceling shows through Feb. 24 for "unforeseen" medical reasons, but it didn't give details.

Frontman Jon Anderson already was sitting out the band's tour after suffering a severe asthma attack in May. He was then diagnosed with acute respiratory failure and was ordered by doctors to rest for at least six months.