Icon, institution, treasure, legend—however you want to characterize John Prine, he’s a brilliant songwriter with a wry, irreverent sense of humor who’s been defining/pillorying/satirizing/illuminating the American condition for more than four decades. His classic, pretty good, not bad songs about Paradise, Montgomery, and illegal smiles are still relevant today, and you can complain about that as you sing along. Health problems have ravaged his 70-year-old voice, but it’s still full of spunk. He hasn’t issued an album of new songs in over a decade, but last year collaborated with a bevy of female singers on a country classics collection (For Better, Or Worse) and he’s recently released September’ 78, a prime Prine live show with a sprawling electric band. Opening are Larry Campbell and Teresa Williams, just about to release their second terrific album, Contraband Love, a rowdy scrum of country, rock, gospel, and blues.