All that's old is made new again: pegged jeans, environmentalism, Cher, blues. Apparently, the same holds true for blues venues. The Backroom Blues Bar wasn't the most famous venue in South Florida when it closed six years ago, but it was one of the most storied. A list of blues greats had played its stage: James Cotton, who taught Muddy Waters how to sing "I Got My Mojo Workin'"; John Mayall, without whom you'd have never heard of Mick Taylor; Fleetwood Mac, or, arguably, Eric Clapton; Leon Russell, without whom neither The Byrds nor Joe Cocker would ever have sounded so cool. The list goes on. When owner John Yurt decided to throw in the towel to home-school John Jr., the blues done got blue. No more! The Backroom is back, occupying the space formerly known as Hideaway. Already, bent and broken-hearted notes from battered hollow-bodies are rending the air above Boca. Rejoice.