AC/DC have been known to inject their hard rock with some old-school flavour. The freight-train boogie and lean guitar runs powering “Baby, Please Don't Go” speak to the Aussies' love of '60s R&B ravers, and the syncopated crunch anchoring “Shake a Leg” channels the early-career destructive energy of The Who. The heavily distorted “Rocker” reaches back even further with a raucous hiccup lifted straight from Memphis rockabilly.