Singer John Mayer has been forced to cancel two performances and also push back his album until next year. The singer is having a problem with his vocal cords and has developed a granulomas. Granulomas are nodules and can be harmless or very serious. His upcoming album “Born and Raise” is almost completed but John wants to put some finishing touches on the album but it’ll will have to wait. See what John wrote on his blog about the issue after the jump. @Julie1205