FILE - In this Feb. 16, 2013 file photo, Ted Dwane, of the English folk rock band Mumford &amp; Sons, performs at the Susquehanna Bank Center in Camden, N.J. Mumford &amp; Sons on Thursday, June 13, 2013 announced it has canceled its headlining performance at Bonnaroo Music &amp; Arts Festival in Tennessee. The decision comes after Dwane received treatment this week for a blood clot on his brain. (Photo by Owen Sweeney/Invision/AP, file)