Saadiq keeps proving that he is a master of musical reinvention and one of the last pure musicians and great songwriters from the New Jack Swing era operating in commercial music. Like Raphael Saadiq’s acclaimed 2008 album, The Way I See It-a downtown ode to the Motown-Stax-Philly International eras-his latest album due out May 10, Stone Rollin’, conjures up nostalgia, with dust-track roads and sock-hop, bluesy, British soul fusion.