A longstanding Dr. John mystery was solved online just a few months ago. It concerns a strange album called Zu Zu Man, that the fly-by-night Trip label released around 1975. It looked fine, with a vintage cover photo of the man onstage, and the songs actually weren't bad. Only trouble was, the singer wasn't Mac Rebennack, but a guy doing his darndest to sound like him. “It ain’...