No one has mentioned Joe Isaacs. Wasn't he a member of the Greenbrier Boys after Bob Yellin left? He was and is a great bluegrass banjo player. He has been performing with his family on the bluegrass and gospel circuit and the Isaacs Family has been a very popular group, consistently charting on Gospel radio. His two daughters and son are excellent musicians and they have written some good music as well. Daughter Sonya Isaacs is now building a solo career out of Nashville.