Laura Cortese and the Dance Cards have a vision for their band’s sound: bold and elegant, schooled in the lyrical rituals of folk music and backed by grooves that alternately inspire Cajun two-stepping and rock-n-roll hip swagger. Cellist Valerie Thompson (cello/vox), fiddler Jenna Moynihan (fiddle/vox), and bassist Natalie Bohrn pair their sophisticated string arrangements and rich vocal harmonies to band leader Laura Cortese’s poignant and powerful singing. For their forthcoming album, the band is exploring their special and less common instrumentation with the support of Sam Kassirer, album producer of folk-pop favorites like Lake Street Dive and Joy Kills Sorrow. The result is a sound that can start as a string band, and morph into a string quartet, female acappella group, or indie band; all while staying honest and true to their identity as folk instrumentalists. Watching them on the main stage at a summer folk festival, or tearing it up late-night at a club, you get the sense that they might snap some fiddle strings or punch a hole in the bass drum. At One Longfellow Square. 8-10:30pm. $12 adv./$15 day of. FMI: onelongfellowsquare.com.