Soul soother Lou Rawls was by no means limited to one genre: He extended his slow-burn finesse to jazz and blues, among other styles. “I Ain't Got Nothin' but the Blues” proves his knack for prowling lamentations, while his loving takes on “At Last” and “Georgia on My Mind” are impeccable showcases for his tenderly dynamic voice. He even puts his own spin on sultry disco with the orchestral reverie “Pure Imagination.”