Wonder’s second album of 1966 is frequently accomplished and yet clearly transitional, often times a more fascinating listen then a strictly successful one. As a document of the 16-year-old wrestling with his changing voice, his deepening thematic complexity, and Motown’s evolving and occasionally confused approach to deploying their in-residence genius it is a priceless historical document. As an album, it’s a mixed bag — juxtaposing genuinely thrilling moments like the Wonder co-write “Be Cool, Be Calm (And Keep Yourself Together)” with relatively staid and bloodless covers of songs by Bob Dylan and Sonny Bono. The evolving social consciousness represented by his reading of the union anthem “Sixteen Tons” hints at his future role as a crucial voice of the underclass, but Wonder has yet to sufficiently embroider his own vision onto the Motown sound to make it his own. Politics are coming down the line, and soon, but the sublime, Smokey-style soul ballad closer “Hey Love” is probably the highlight here. This is Wonder’s Beatles For Sale: slight and inspired, vaguely fatigued and utterly pregnant with impending greatness.