AC / DC was well advised to entrust this new production to Rick Rubin and Mike Frasier to refocus its "sound" to the roots so dear to the little scholar: The Blues. More Hard Rock that Australians drive offers us a rather inspired while reconnecting with what actually greasy blues that made the delight of aficionados of the Bon Scott era. A pleasure never comes alone, we also greet the unexpected return DU original drummer of training, king of time background and supported tempo, of course I called Phil Rudd. Since its comeback in 90, AC / DC once again proves he still has beautiful remains. 15/20