Producer and composer Curt Boettcher was among the principal architects of the sunshine pop sound of the mid-'60s, his harmony laden, melody rich approach gracing the Top Ten hits of the Association as well as his own projects, including Sagittarius and the Millennium. Born and raised in Wisconsin, he began his career as a folksinger, co-founding the GoldeBriars in 1962; the group's self-titled debut album appeared on Epic two years later. Although the GoldeBriars' complex harmonies anticipated the style of Boettcher's subsequent work, the foursome dissolved after a second LP,...