The final installment in the four-part series documenting the career of one of the bestselling bluegrass acts of all time marks their 50th anniversary as members of the Grand Ole Opry by presenting unreleased tracks recorded shortly after they were named Country Vocal Group of the Year by the Country Music Association in 1971! Bobby, Sonny and Robby shine on 8 long-lost gems including Gonna Be Raining When I Die; Muddy Waters; the Oak Tree; My Baby's Gone; Going Back to the Mountains; When I Stop Dreaming; the Hard Times, and Half a Mind ! Pinecastle Records.