Following Jim Dickinson’s triumphant performance in Riverfest’s Arkansas Tent, there comes word that three of the musicians who played in support at that gig (Dickinson dubbed them the Rackensackers, an early synonym for Arkansans) are at work on a documentary on the famed producer, session man, singer/songwriter and Little Rock native.* Their roles, at this point, remain somewhat ill-defined, but the principals include Greg Spradlin (guitar), Dylan Turner (drums) and Jason Weinheimer (bass).