. . . . "The artists at Tree House on any given night run the gamut from blues to folk to jazz quartets, with the occasional hard rock or hip-hop act. ???We keep it melodic, and they have to be positive,??? Hoss says. ???We do pretty much everything except hardcore and death metal.??? Since opening last April, Hoss says he???s booked about 450 bands, 400 of which were touring acts." .