Riley Etheridge, Jr. may call New York City his home now, but his music sounds like he’s still living down South. A South Carolina native, Etheridge spent many years living - and playing music - in Louisiana, and listening to his sophomore effort, “Powder Keg,” it’s as if he has never left.

“Powder Keg” ignites with the fiery Southern-style, blues-rocking title track that opens the disc, and Etheridge keeps a Louisiana groove going on songs like the funky “Scene of the Crime,” the lively, Zydeco-flavore…