Arguably the most divisive album in the history of metal, no other record seems to split opinion quite likeMetallica’s The Black Album (Elektra). Otherwise known simply as Metallica, whenever the San Franciscan act’s fifth studio album is mentioned even in passing, the results are usually the same. Like a red rag to a bull, loud and vociferous “true fans” are still guaranteed to leap straight in with comments like “only the first four albums are real”, “sell-outs” and “commercial bullshit” etc.