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Review: Six years is ages for a band to go without releasing an album or doing very much. But for AC/DC, whose work rate has always been ridiculously high, it's a very, very long time. Between then and now, the band lost their lead singer, Brian Johnson, to hearing difficulties in the middle of their last tour, and saw drummer Paul Rudd arrested in New Zealand for 'attempting to procure a murder'. Talk about impetus to finally call time.

But then these are the guys responsible for one of history's greatest heavy rock triumphs, 1980s's Back In Black, released just months after formative frontman Bon Scott tragically passed. So it's no surprise Power Up, another post-traumatic release albeit an act of reunification with now (relatively) healthy Johnson and innocent Rudd returning, is among their best in the 40 years since. A comeback record that sounds exactly like AC/DC should - ballsy, bluesy, boozy riffs.