Frank Dean knows what he's doing. His past bands — Blue DeVille and Sindacato — thrived by mining and updating the roots of American music. This time out, he attacks the blues, and he's got another winner in the Snakehandlers. Their debut, the perfectly titled Rock plus Roll, leaves you feeling like you stumbled into a roadside bar and discovered an authentic, gritty blues band. You can taste the beer, smell the cigarettes, picture the packed dance floor. These 11 songs all will sound somewhat familiar — such is the nature of blues riffs — but each one is marked by something distinguishing: Clint Crabb's sweet, smooth slide guitar; Bob Schneider's rolling organ and rollicking piano; Scott Parkhurst's howling harmonica; growled vocals by multiple band members. (Drummer Carl Lo Sasso, bassist Floyd Tucker and guitarist Dean complete the lineup.)