Singer Linda Ronstadt, known for her '70s and '80s hits "You're No Good," "Hurt So Bad," and "Don't Know Much," has been left unable to sing due to Parkison's Disease. She revealed the diagnosis to AARP, saying she thinks she's been affected with the condition for seven or eight years. "No one can sing with Parkinson's disease," she told the magazine. "No matter how hard you try." The 11-time Grammy winner is publishing her memoir, Simple Dreams, in September.