When it comes to ’70s soul visionaries, Stevie Wonder, Sly Stone, and Marvin Gaye spring to mind. But for a startling memory-jogger, proceed to the reissue of this lost 1974 treasure. Like Wonder, the self-reliant, sweet-voiced, then-17-year-old Otis is on every track, stirring up soul, jazzy chords, psychedelia, and studio ingenuity into a tasty, weird mix. You’ll recognize ”Strawberry Letter 23,” which became the Brothers Johnson smash. Everything else, like all great music, sounds familiar and otherworldly.