Wild cards in the stacked deck of Boston rock bands, Sarah Borges and her band, the Broken Singles, plays torchy country rock and barroom rhythm-and-blues in a brash, soulful style that's built for dancing and drinking — but not just dancing and drinking. The group's idea of a killer cover is the Magnetic Fields' "No One Will Ever Love You," and its concept of art rock is leaping onto a table to lead a blues sing-along. Borges can purr and wail with the best of the garage-rock kittens, and her veteran rhythm section always swings. Last year's underrated The Stars Are Out may not have been a breakout record, but St. Louisans who caught the band's torrential set at Twangfest 13 can relish the fact that Borges remains their secret, for now.