From James Hetfield's love of Free Bird to a Lynyrd Skynyrd riff sneaking its way into a Metallica classic, the Four Horsemen have plenty to thank the Southern rock legends for

Lars Ulrich and James Hetfield discuss what makes them different to other bands in this vinyage interview recorded during the Day On the Green Festival in Oakland, 1985

By the time they recorded Master Of Puppets, Metallica had outgrown the scene they had single-handedly inspired... but two decades later they would embrace thrash again

Metallica's Master Of Puppets took the band to the cusp of real success, but as their last with bassist Cliff Burton it's forever stained with the sadness and tragedy of his death

From Lizzo channelling Rammstein to the likes of Lady Gaga and Miley Cyrus collaborating with Metallica, pop stars have embraced metal more often than you might think