The Blues A Musical Journey: Godfathers and Sons

'Blacks plus Jews equals the blues,' runs an old adage on Chicago's Maxwell Street, the original home of Polish expat Leonard and Phil Chess's seminal Chess Records. Muddy Waters cut not only his legendary '40s and '50s tracks for the imprint, but also his late-'60s crossover experiments 'Fathers and Sons' - with various young rock acolytes - and 'Electric Mud', which numbers among its few admirers Public Enemy's Chuck D. Marc Levin's film follows Leonard's heir Marshall as he welcomes D and the rapper Common into the old fold to take a shot at HipHop-blues and hear stories from the glory days. Marshall's such a voluble witness that his story pretty much overtakes the film - an introduction to some of the backing band characters would have been handy - but it's compelling material any which way.