The role that radio played in making music stars is recalled in the Season 3 finale, which features clips of such classic entertainers as Bing Crosby, Cab Calloway and Kate Smith. Feinstein also visits with Rose Marie, who began her career as a child singer; learns about the intersection of classical and popular music from violinist Joshua Bell and pianist Jeremy Denk, who perform together; and discusses his duet with Rosemary Clooney after discovering a lost radio program that featured her.