Bobby Caldwell (August 15, 1951 – March 14, 2023) was an American singer, songwriter and multi-instrumentalist who, despite a prolific musical output over his 30-year career, was still best known for his 1978 hit single "What You Won't Do for Love." While he has always maintained a devoted fan base in the United States, a more legendary status has been bestowed upon him in Japan. Early life Bobby Caldwell was born in Manhattan to Bob and Carolyn Franklin, the hosts of Suppertime, an early television variety show.