Boss Hog were among the most mysterious, fascinating bands on the ’90s scuzz-rock circuit. Frontwoman Cristina Martinez posed for album covers and sometimes even performed naked. Jon Spencer, her husband and former Pussy Galore bandmate, held down supporting-actor duties even as his Jon Spencer Blues Explosion was blowing up. And together, they pounded out a nasty junk-blues groove more charismatic than what most of their noise-gargling contemporaries could manage. So it’s cool that Boss Hog are coming back later this spring with Brood X, their first album in 17 years. We’ve posted their songs “Wichita Grey” and “17,” and now they’ve shared the janky, stop-starting “Formula X.” Check it out below.