Jamaican singer Derrick Morgan recorded the song "Conquering Ruler" in 1967, and it was no empty boast. He dominated his country's airwaves in the early '60s when he was barely out of his teens. Now 73 and performing regularly, Morgan is equally proud of his endurance. But Morgan never had much choice. He grew up near Kingston's Orange Street, which was lined with record stores and producers. Morgan studied bookkeeping at school and began singing for his classmates. An eye disease left him with poor vision and unable to ever crunch numbers professionally. Fortunately, Morgan's winning rendition of Little Richard's...