“Thom Bell left an indelible and everlasting mark on the history of popular music, but even more so, he will be remembered by all who knew him as a kind and loving friend and family man. The music world has truly lost one of the greats,” his attorney wrote in a statement published in Billboard magazine. By Post Staff Songwriter Thom Bell, a classically trained instrumentalist who wrote songs for 1970s singing groups Delfonics, Spinners and Stylistics, passed away at his home Bellingham, Wash., on December 22. He was 79. With Kenny Gamble and Leon Huff, Bell gained renown in creating what became known as the “Sound of Philadelphia,” writing, arranging