Uh oh. There has been a crushing setback for singer John Mayer. Just when things seemed to be cooking for him, with a new album and tour on the immediate horizon, the active-on-social-media guitarist took to his personal Tumblr to reveal some bad news. Mayer visited his throat doctor on Wednesday (March 7) since “something didn’t feel/sound right” during rehearsals on Tuesday (March 6.) It was a bad omen that revealed a big problem.