One glance at the cover of The Doors’ debut album and you knew the summer of love was over and the flower children were headed straight for the sanitarium. These Doors, as drummer John Densmore later quipped, were clearly “unhinged.” Ray Manzarek carried the stern countenance of a Protestant preacher, hunched over the keyboard driving Jim Morrison into new, uncharted realms as he delivered psychedelic sermons. Manzarek’s studied glare behind his rimless glasses and stiff, formal appearance (preferring suits to the colorful ad-hoc hippie esthetic) gave him the air of a tidy yet maniacal schoolmaster while guitarist Robby Kreiger resembled...