Bluegrass and country singer Frank Brown earned the nickname "Hylo" thanks to the considerable vocal range that became his trademark. Born in 1922 in Johnson County, KY -- later the birthplace of Loretta Lynn -- Brown had thoroughly absorbed the music indigenous to his Appalachian home before moving with his family to Ohio, where his career as a performer began to gather steam. There, he played on local radio broadcasts and began writing songs; one composition, a tribute to the Grand Ole Opry, was recorded by Jimmy Martin. In 1950, he sang harmony on a Bradley Kincaid session....