A new music group, Rochester Folkus, is here to promote acoustically based music — whether it's bluegrass, Celtic, folk, or whatever. And this will be on a semi-regular basis on the second and fourth Wednesday of each month at Downstairs Cabaret. The maiden voyage takes place this week with Sally Rogers, whose storied lyrics are rivaled only by an amazing voice that can't be caged. Rogers will be joined by claw hammer, five-string banjo maniac Howie Bursen. In the following weeks, Folkus will be bringing in Americana singer-songwriters Terry Leonino and Greg Artzner (November 29) and local favorites, The Dady Brothers (December 13).