Jon Spencer is possibly the hardest-working man in rock. When not busy fronting the Jon Spencer Blues Explosion, he can be found moonlighting with Boss Hog, a four-piece led by his wife, Cristina Martinez. Hog mine much of the same territory, but whereas the Blues Explosion add hip-hop beats and art-school concepts, Hog firmly place the emphasis on full-force rocking out. The result is a blues...