Indie rock stalwarts Portugal. The Man scoring a Top 40 hit over a decade into their career? Stranger things have happened than the success of “Feel It Still”. To most people, the self-styled Lords of Portland might have all the makings of a one-hit-wonder. But fans familiar with the deep, diverse, eight-album output know otherwise. As does anyone who has seen their live performances sway between swirling psych-rock and pummelling heaviness. “So Young” is an infectious, slow-burning groove.