“Grin, even when you’re at your lowest, grin,” implores Mackey Feary on the opening track of his 1978 solo album Mackey Feary Band.  “You’re Young” is all sun and breeze, making it near-impossible to suppress the requested grin.  It’s languid yet funky, with shimmering guitars, wending saxophone, and sweet female background voices adding to the luster.  As a founding member of Kalapana, Feary had been at the vanguard of Hawaiian pop in the 1970s; alongside such artists as Cecilio and Kapono and Keola and Kapono Beamer, Kalapana delivered a rich, smooth style…