The Sons of the Pioneers were the foremost vocal and instrumental group in western music, and the definitive group specializing in cowboy songs, setting the standard for every group that has come since. They were also one of the longest-surviving country music vocal groups in existence, going into their seventh decade. More important than their longevity, however, the greatest achievement of the Sons of the Pioneers lay with the sheer quality of their work. Their superb harmonies and brilliant arrangements delighted three generations of listeners and inspired numerous performers. The group's roots lay in the depths of the Great Depression, a time when the American spirit, and the spirits of millions of Americans, had nearly been broken by physical, economic, and emotional privation. Cincinnati-born Leonard Slye (born November 5, 1911) had headed out to California in the spring of 1931 from his native Ohio, working jobs ranging from driving a gravel truck to picking fruit for the Del Monte company in California's Central Valley. By sheer chance, he entered an amateur singing contest on a Los Angeles radio show called Midnight Frolics and a few days later got an invitation to join a group called the Rocky Mountaineers. Slye played guitar, sang, and yodeled with the group, and before long they wanted an additional singer so they could extend their range. The man who answered the ad was Bob Nolan (born Robert Clarence Nobles, April 1, 1908, New Brunswick, Canada), from Tucson, AZ. Nolan had lived the life of an itinerant singer for a few years before settling down in Los Angeles, where he'd worked as a lifeguard as well as tried to make a living singing. Nolan joined the Rocky Mountaineers, and he and Slye developed a harmonious relationship that worked for several months,...