found:B.B. King live at the Regal [Phonodisc] 1965.
found:B.B. King anthology, c1992:title page (B.B. King) page 77 (nickname B.B. short for Blues Boy)
found:AMG, Aug. 13, 2009(B.B. King; born Riley B. King on Sep. 16, 1925 in Indianola, Miss.)
found:Grove Music online, Jan. 15, 2014(B. B. King; Riley B. King; b. Sep. 16, 1925 in Itta Bena, Miss.; American blues singer and guitarist)
found:Enc. of popular music, 4th ed.(B. B. King; born Riley B. King on Sep. 16, 1925 in Indianola, Miss.)
found:B.B. King website, Jan. 15, 2014(B.B. King; Riley B. King; b. Sep. 16, 1925 on a plantation in Itta Bena, Mississippi, near Indianola)
found:The New York times website, viewed May 15, 2015(B.B. King; b. Riley B. King (the middle initial apparently did not stand for anything) on Sep. 16, 1925 in Berclair, Miss., a hamlet outside the small town of Itta Bena; d. Thursday [May 14, 2015] in Las Vegas, Nev.; B.B. stood for Blues Boy, a name he took with his first taste of fame in the 1940s)
B. B. King
Label from public data source WikidataKing, B B