The Bailey Brothers and the Happy Valley Boys are an American bluegrass act widely considered to be among the first to cultivate the duo harmony vocal technique widely used in modern bluegrass music today.[1] Charlie Bailey (February 11, 1916 in Happy Valley, Tennessee, near Rogersville – March 12, 2004 in Bear, Delaware) began his musical career in 1936. His brother, Danny Bailey (1 December 1919, Happy Valley, Tennessee – 22 March 2004, Knoxville, Tennessee), teamed up with him in 1940, and the brothers began making frequent appearances on Tennessee radio stations in the Knoxville area.