What did a recorder of Mockin' Bird Hill  famously pioneer?
Mockin' Bird Hill: Mockin' Bird Hill is a song, written in 3/4 time, by George Vaughn Horton, and perhaps best known through recordings by Patti Page, Donna Fargo, and by Les Paul and Mary Ford in 1951. Les Paul: Lester William Polsfuss (June 9, 1915 – August 12, 2009), known as Les Paul, was an American jazz, country, and blues guitarist, songwriter, luthier, and inventor. Les Paul:  He was one of the pioneers of the solid-body electric guitar.
i don't know