For almost 20 years, “Chickenbone George” Alan Sparhawk has moaned, barked and wailed into an antique microphone as leader of Duluth’s most distorted blues band, the Black-eyed Snakes. Guitarist “Big House” Bobby Olson and drummer “Smokin’” Brad Nelson have been with ol’ Chickenbone since near the beginning. Percussionist Bryan “Lefty” Johnson became a regular in the group at least a decade ago. Tighten the light fixtures, reinforce the floors and avoid sharp objects—it’s the Black-eyed Snakes. The band released its third album, Seven Horses, in June.