Friday's show at Revolution doesn't officially have anything to do with the Jam Cruise, but it might as well. Boat or no boat, upstate New Yorkers Donna the Buffalo are cut from the same free-wheeling, improvisation-based musical cloth as many of their buddies who are sea-bound the following Monday. As with other acts of its ilk, the group's sound draws on a variety of rootsy genres, from folk to blues to country to even zydeco — despite the frosty climes from which it originated. Donna the Buffalo also loves its soulful organ stabs. What really sets the group apart, though, is the skill of core members Jeb Puryear and Tara Nevins, whose male-female, back-and-forth interplay creates a driving, unique dynamic. Opening is Crazy Fingers, a favorite of South Florida Deadheads for more than two decades.