The term “prison blues” isn’t just for inmate uniforms. When this April 3, 1978 photo was taken blues legend B.B. King played to a packed auditorium of residents and press at the Massachusetts Correctional Institution in Norfolk. King had been playing to prison crowds since 1972 when he and Boston attorney F. Lee Bailey formed the Foundation for the Advancement of Inmate Rehabilitation and Recreation, an inmate services organization. (AP Photo/Michael S. Gordon)