Doctors advised AC/DC singer Brian Johnson to "stop touring immediately or risk total hearing loss." http://consequenceofsound.net/2016/03/acdc-frontman-brian-johnson-ordered-to-stop-touring-immediately-or-risk-total-hearing-loss/
I hope there is more to this story, for Brian Johnson's sake. Not only is AC/DC known as one of the loudest bands of all time (http://tinyurl.com/jhyfgx9), Mr. Johnson has cited race car driving as a cause for hearing damage in past interviews. Whatever may be the exact cause, musicians like Brian Johnson rely on their hearing to deliver their performances, night after night. It is a real tragedy when a performer can no longer continue due to hearing problems.