I suspect that if you'd told Michael Doucet, back when he decided to form the Louisiana band BeauSoleil and explore, honor and curate the future of Cajun music, that they'd be going 45 years later, his initial reaction would be pride.

Well, MAYBE he'd be a bit surprised. A half-century is a long time.

But the fiddle-and-accordion sound of BeauSoleil avec Michael Doucet is so genuine, infectious, distinctive and seductive — and its members so passionate about it — that their globetrotting ambassadorship of this wonderful French-language music is something they assuredly regard with humble satisfaction.

Take note, though: all good things indeed come to an end — even in 3/4 time. The band is out on their "Au Revoir: One Last Time" tour and on Wednesday stop by the Katharine Hepburn Cultural Arts Center. One last dance with an old friend?

BeauSoleil avec Michael Doucet,  7:30 p.m. Oct. 20, Katharine Hepburn Cultural Arts Center, 300 Main St., Old Saybrook; $45; thekate.org, (860) 510-0453.