This edition is called “On the Air,” and examines the role of radio, back when it was the dominant medium popularizing songs and songwriters. Artists covered include Rosemary Clooney, Bing Crosby and, pictured, a very young singing sensation named Baby Rose Marie. Many, many decades later, having dropped the “Baby” prefix, she would be featured on The Dick Van Dyke Show, playing comedy writer Sally Rogers. Check local listings.