From the record-breaking success of 1991’s ‘Black Album’ to the band’s reinvention with the Load/Reload albums; from bassist Jason Newsted’s shock departure to the group’s subsequent meltdown as laid bare in the documentary Some Kind of Monster; from the Lulu album with Lou Reed to their hugely expensive feature film Through the Never, the second half of the Metallica story has been as eventful and controversial as it has triumphant.