Brian LeBlanc says that his favorite music helps to lift the fog of Alzheimer’s. Immersed in fog. That’s how Brian LeBlanc describes his bouts of confusion from Alzheimer’s. “Imagine you’re driving down a road on a beautiful fall day,” he says. “The sun is shining, the trees are orange and purple. You come to a bend in the road and, all of a sudden, you hit a fog bank. Your natural reaction is to slow down, creep along. I can be doing anything, and all of a sudden this fog comes in and takes over my brain. I can still…