Terry Gross

Dion, a former teen idol, was deeply influenced by blues and country music. He had his first hit, "I Wonder Why," in 1958, with the doo-wop group The Belmonts. Originally broadcast in 2000.

Toussaint was an important behind-the-scenes figure in New Orleans R&B during the '50s and '60s. He later became known for his own recordings. He died in 2015. Originally broadcast in 1988.

Wexler produced hits for Atlantic Records by Ray Charles, Aretha Franklin and Wilson Pickett, and is credited with coining the term "rhythm and blues." He died in 2008. Originally broadcast in 1993.