Roger Waters is about to launch a tour where a 36-foot-high wall will rise up each night between him and his fans — and right now, you wouldn't blame him for wishing the thing was a bit more portable. The former Pink Floyd leader has just ducked his still-gangly six-foot-three-inch frame into a town car for a ride to a midtown Manhattan restaurant, and it is immediately clear that the driver is way too excited to see him. Waters braces himself. "Been a fan all my life, man," says the driver, a baseball-capped, middle-aged dude named Fred, with a broad New York accent. " 'Wish You Were Here' — I was backpacking in Europe when I got turned on to it. I was like, 'This is the best album evvuh!' It must be an unbelievable feeling to know what an impact you made on my generation."