When Smokey Robinson left the Miracles in the early seventies to become a Motown vice president, he claimed that he didn’t want to make solo records. Since then, of course, he has waxed quite a few—including hits that rival such Miracles classics as “Tracks of My Tears” and “I Second That Emotion.” The most recent proof that Robinson’s high, elastic voice is a national resource comes on Touch the Sky, which marks a welcome return to self-production and includes a generous sampling of his self-penned odes to old-fashioned romance.