The aftershocks of the Summer of Love extended far beyond its original epicenter. Genteel Québécois singer Robert Charlebois got swept up in the shifting cultural tide, re-emerging in 1968 as a madcap psychedelic-rock visionary alongside budding vocalist Louise Forestier. The duo harmonize in ecstatic unison on sing-alongs like “California” and “Lindberg,” as if entranced by the same cult-induced spell. But their lone joint album isn’t all hippy-dippy bliss; on the epic acid-funk jam “Engagement,” Charlebois unleashes enough hoarse hysterics to out-freak Can’s Damo Suzuki.