found: Winston, W. Pedal steel guitar, c1975.
found: Rathburn, E. Mostly railroad music [SR] p1994:container (Billy Keith, banjo)
found: Newport Folk Festival. 1963-07-27, Bluegrass bands, fiddle workshop and children's concert [SR] 2004:audition (Brad Keith, banjo)
found: All Music Guide WWW site, Dec. 28, 2006(In the mid 1960s, Keith joined Bill Monroe's Blue Grass Boys, where he was listed as Brad Keith)
found: Oxford music online, April 24, 2014:Enc. of popular music, 4th ed. (Bill Keith; born William Bradford Keith, December 20, 1939, Boston, Massachusetts; bluegrass banjoist; member of Bill Monroe's Blue Grass Boys, Country Gentlemen, Jim Kweskin Jug Band, Muleskinner)
found: New York times WWW site, viewed Oct. 27, 2015(in obituary published Oct. 26: Bill Keith; b. William Bradford Keith, Dec. 20, 1939, Boston; d. Friday [Oct. 23, 2015], Bearsville, N.Y., aged 75; banjo player who modernized his instrument and expanded its musical reach)