"I was in the car the first time music seemed strange: the instruments less distinct, the vocals less crisp." John Cotter was thirty years old when he first began to notice a ringing in his ears. Soon the ringing became a roar inside his head. Next came partial deafness, then dizziness and vertigo that rendered him unable to walk, work, sleep, or even communicate. At a stage of life when he expected to be emerging fully...