UPDATE (6.14.13): In a statement on Friday, festival organizers named Jack Johnson as the new headliner, replacing Mumford and Sons. "I've got a lot of lyrics and chords to relearn by Saturday night," Johnson admitted. " I was here to play the first Bonnaroo and it is a very special festival to my band. We are excited to hit the stage again."

After revealing that bassist Ted Dwane needed to undergo emergency surgery this week to remove a blood clot from his brain, Mumford and Sons postponed a handful of shows. On Thursday, the band announced that Dwane had been released from the hospital after a successful surgery, but they will not be appearing at Bonnaroo this weekend, as Dwane is now focused on recovery. They were slated to headline the event this Saturday night.

At press time, a replacement headliner had not been announced by festival organizers. Read the note from the band below.

"It is with great joy that we can announce that Ted has been discharged from hospital and is on the road to a full recovery. The surgery went well, and the excellent medical team helping him are very pleased with his progress. He has been nothing short of heroic in how he has handled the whole ordeal, and now it has been medically proved that he does indeed have a brain.

Today, however, also marks the end of our Summer Stampede Tour. We were hoping to have made it out by Bonnaroo this weekend. But it is with sadness that we have to announce the cancellation of our scheduled performances at both Bonnaroo and Telluride Festivals, and our show at Cricket Wireless Amphitheater in Bonner Springs, KS. If we could’ve we would’ve, you know that about us. We trust that you can respect our collective desire to encourage Ted to make a full recovery, and that this is based purely on the medical advice we have received.

On behalf of Ted, and all of us really, we would like to thank every one for their compassion and support at this time and we are very excited to get back out on tour as soon as we can."