John Mayer -- Throat Condition Derails Concerts, Album

John Mayer is canceling two concerts and postponing his album until next year because he's having problems with his vocal cords.

Mayer revealed the problem on his blog, saying he had developed a granuloma in his throat. Granulomas are nodules, and they vary from harmless to very serious. John didn't elaborate.

He was scheduled to perform at the iheartradio Music Festival in Las Vegas next week and a show with Tony Bennett in Los Angeles.

Mayer also said his next album, which was due later this year, will now be pushed back to 2012.

He says he'll devote his time to "writing and composing more music and kicking an empty soup can around the West Village."