John Mayer made an announcement on his blog this morning that he's been forced to cancel all scheduled live shows due to a recurring problem with his vocal cords.

John told fans

During rehearsal on Tuesday, it came to mind that I should see my throat doctor because something didn’t feel/sound right. I went in for a visit on Wednesday and a scope of my vocal cords revealed that the granuloma has grown back where it had mostly healed. This is bad news. Because of this, I have no choice but to take an indefinite break from live performing. Though there will be a day when all of this will be behind me, it will sideline me for a longer period of time than I care to have you count down.

[John Mayer on Tumblr]

From 2008, here's John performing Tom Petty's Free Fallin'.