With his avuncular appearance, rich baritone, and whistling prowess, African-born British pop singer Roger Whittaker seemed like a late successor to Bing Crosby when he emerged to worldwide popularity in the 1970s. Already a success throughout Europe and Canada, Whittaker was almost 40 when he made his biggest impact in the U.S. with his 1975 hit "The Last Farewell." He continued to chart with the occasional single or album Stateside, though in the '80s and '90s, his biggest audiences remained in Europe. He enjoyed a particularly high status in Germany, where his phonetically ...