Larry Campbell and Teresa Williams are a powerhouse couple. Campbell has backed up Levon Helm, Bob Dylan — as Dylan's guitarist for eight years on the "Never Ending Tour" — Paul Simon, BB King, Elvis Costello, and Roseanne Cash, to name a few. Williams has worked with Emmylou Harris and Mavis Staples. Their individual careers have been impressive, but together, it's an entirely new beast. The husband-and-wife duo released its first album last year, and it's a classic-sounding mix of blues, country, rock, and a little gospel that's obviously been howling to come out from the couple for years.