The "temporary setback" that sidelined John Mayer's voice for almost half of 2011 is likely to remain a big part of 2012. The "Gravity" singer was diagnosed last September with granuloma, a lesion that forms in the throat, causing him to cancel performances and delay his latest album, "Born and Raised." 


In October, he underwent surgery to remove the lesion, stating that he had hoped to be back performing in a month or more.


"I never thought I’d be wishing I could do what I love again; I stay in at night, picking guitar parts off of records and dreaming of playing on the big stage," he wrote on his Tumblr page. "The only difference between now and when I was 18 is that now I have this beautiful, meaningful record waiting for me when I can sing it."


In a post Friday, Mayer delivered more bad news to fans looking forward to his upcoming tour. 
"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."
While the 34-year-old admits this latest news is crushing, he says he plans to keep busy by working on his next album right away, taking advantage of time that otherwise would have been spent touring. 
"Somewhere in all of this is another surgery and a very long chemically imposed period of silence, so I hope you’ll understand that I have to really pick that date carefully," he writes. 
Chuck Leavell, the keyboardist for the Rolling Stones and a co-founder of the Mother Nature Network, worked with Mayer on his latest album and was set to tour with him. "We were all terribly saddened and distraught," says Leavell. In just the first four days of our rehearsals for the tour, the news came from his doctor that it had come back, perhaps worse than before. While it is a huge disappointment for all of us that the tour has to be cancelled, it is certainly much worse on John than on anyone. John is a great guy and amazing talent."
Leavell continued: "I feel so badly for him, and gave him a personal hand written note of encouragement before we all left. I can tell you that in the four days we had to rehearse, the band was sounding amazing. We listened to some playbacks of it before we scattered, and we were all so happy with the way it was going. Hopefully John will eventually conquer this and we can let his fans see and hear what John and all of us were so excited about. The good news is that we were able to finish his CD Born and Raised, and I know it will be widely accepted and praised by his fans, the music industry and the media. I'm proud to have my name on it."
Mayer's continued vocal issues come in the wake of another performer's triumphant recovery from voice surgery last month. Adele, who suffered a vocal cord hemorrhage in October, gave a stirring live performance at the 2012 Grammy Awards. The 23-year-old credits Mayer with helping her get through the ordeal. 
"John Mayer had it [surgery] done at the same time as I did,” she told Vogue, “and he really helped me be chilled out about it."
While this latest news is frustrating to Mayer, he's nonetheless maintaining the same upbeat outlook he's had throughout this health setback. 
"The greatest gift in the world is being able to create music no matter what the circumstances," he writes. "So these are the new circumstances, and I’ll find a way to make it mean something. That’s all you can ever do."

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

John Mayer's granuloma returns
Musician announces that he's going on 'indefinite hiatus' after an unsuccessful attempt to repair his vocal cords.