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Is this a heavy metal album? Sure, there's plenty of hard rock and an unashamed Led Zeppelin influence here, but the year that punk broke in the UK saw Boston's answer to The Rolling Stones release their rawest and heaviest set of songs ever.

Rocks would go on to inspire and influence the likes of Guns N' Roses, Metallica and Nirvana. Does it rock? You bet your ass it does. It's also Tom Morello's third favourite metal album of all time.

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“Depending on how heavy metal is defined, some might question this band and album. But I grew up loving metal and Aerosmith was definitely one of my bands, so I‘m going to include this one because I consider it to be one of the great hard rock records of all time. It‘s got all the essential elements: it's heavy, it's sleazy, it's funky and it‘s what all bands with pretensions to play hard rock should aspire to.” (Thanks Tom Morello, via his 13 greatest heavy metal albums of all time)