During the 1940s, country music was rapidly evolving from traditional songs and string band styles to honky-tonk, western swing, and bluegrass, via radio, records, and film. The Blue Sky Boys, brothers Bill (1917-2008) and Earl (1919-1998) Bolick, resisted the trend, preferring to perform folk and parlor songs, southern hymns, and new compositions that enhanced their trademark intimacy and warmth. They were still in their teens when they became professional...