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The Revelers, a joyful band out of Lafayette, La., play a lot of swamp pop—timeless Fats Domino-inflected rock ’n’ roll music but with Cajun and zydeco influences. Featuring former members of The Red Stick Ramblers and The Pine Leaf Boys, who’ve appeared on TV with Anthony Bourdain and on David Simon’s Treme, this young Southern combo sings in French and English and uses an accordion and fiddle in addition to guitar, bass, and drums. Not a mere johnny-come-lately Americana outfit, all band members are proficient songwriters with deep roots in their region’s musical culture. Its roadhouse sound includes plenty of uptempo rockers punctuated with honking saxophone blasts, but it balances that with country, blues, and swing-jazz accented slow dance numbers. The ensemble’s cover of Jerry LaCroix’s “The Lonely Room” demonstrates its adeptness for reviving old-school tearjerkers without sounding overly retro. The best moments in its catalogue come from mid-tempo pop-rock numbers like “If You Ain’t Got Love.” Its buoyant, tuneful bounce comes from its sugar-sweet hook, gorgeous guitar and accordion rhythms, and simple lyrical phrasing. The Revelers perform at 8:30 p.m. at Glen Echo Park, 7300 MacArthur Blvd., Glen Echo. $20. (301) 634-2222. glenechopark.org.