Sixties singer Johnny Mathis‘s name has popped up in surprising ways recently. DJ Josh Kun spun the velvet-voiced crooner’s version of “Kol Nidre” at “Get Down, Moses,” Kun’s Jewish/African-American “listening party.” Then, John Waters, the witty, loquacious, and dapper film director, cited Mathis as one of his key “role models.” It happened at an ALOUD ...