Depending on when you might have seen them on their endless tour around the country, Megan Jean and Byrne Klay might have been a folk-tinged duo with Jean on acoustic guitar, or a washboard-strumming revue heavy on campy 1950s horror movie references and 1920s flapper-jazz style vocals. In their most recent incarnation, they’re a mesh of fiercely rhythmic, percussion-heavy propulsion, with the banjo and Jean’s roof-shaking voice the only melodic elements. $5 cover starts at 7 p.m.