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Encompassing twangy western and finger-snapping swing, hepcat rockabilly and strutting jump blues, the ’40-and-’50s-based songbook employed by Vancouver’s Ray Condo and the Ricochets on Swing, Brother, Swing! has one common denominator: that big beat designed to get couples moving on the dance floor. Is such an approach overly retro? Probably, but considering the current glut of formulaic punk, rap, reggae, and techno artists, and the wide spectrum of generally obscure covers adapted by this sax-and-steel-led combo, these Canadians arguably offer a healthy change of pace. They open for rockabilly vet Sleepy LaBeef at 9 p.m. at Twist & Shout, 4800 Auburn Ave., Bethesda. $8. (301) 652-3383. (Steve Kiviat)