Off and on for the better part of the last decade, JJ Grey & Mofro have been demonstrating just what the adage "funkier than a mosquito's tweeter" means. On the band's most recent album, Georgia Warhorse, the illustration becomes explicit. The title refers to a bullet-proof Southern grasshopper, while the heavy musical gruel — acidulous harmonica and guitar licks, sin-soaked gospel pleas, diaphragm-ripping blues moans and bass so mangy and fuzzy it should be in a cage — is consistently thick, funky and satisfying. Even when sneaking in a smooth saxophone solo or getting syrupy on the natural-love-loving "Beautiful World," Grey and Mofro sustain a dark, heavy inchoate groove that puts them at the vanguard of the new Southern blues scene.