Thom Bell, the Jamaican-born producer, arranger, songwriter, and pillar of ’70s Philadelphia soul, has died. The news was confirmed by Philadelphia radio station WDAS-FM. Bell was best known for his work in the “Mighty Three” with Kenny Gamble and Leon Huff; together, the trio created what became known as the “Sound Of Philadelphia.” He was 79. Born in Jamaica in 1941, Bell moved to Philadelphia as a child. He studied classical music, and as a teen sang with Gamble, Huff, and Daryl Hall of Hall & Oates. His first major break in soul music was with Cameo Records, where he...