sentences:  In 1947, he took over for Oscar Moore in the Nat King Cole Trio.He then briefly replaced Charlie Smith, a drummer, in the Oscar Peterson Trio, producing a lineup (piano, guitar, bass) similar to the Cole Trio's; the substitution of a guitarist for a drummer continued until 1958.After leaving the Peterson Trio, Ashby concentrated on session work, which included recording with Norman Granz, Sheb Wooley, LaVern Baker, Howard Roberts, B.B.