The Sons of the Pioneers were the most successful western harmony group of all time, enjoying a career longevity that began in the early 1930s and still continues today, with, of course the obvious personnel changes. They were formed originally as The Pioneer Trio because of Ohio-born Leonard Slye’s , love of harmony singing and his desire to be part of a vocal group. The name change came about when a radio announcer introduced them as ‘The Sons of the Pioneers,’ because, he argued, they were too young to be pioneers. And the name stuck. 

Oh ya .... Leonard Slye ... later changed his name to Roy Rodgers