After Metallica’s performance, Osbourne, 76, came out on stage and performed a five-song set by himself, before he was joined by his former bandmates Tony Iommi, Bill Ward and Geezer Butler for four of the group’s songs.

Ask most music fans who “invented” heavy metal and they’d likely point you in one direction: Black Sabbath. The group’s self-titled debut album was recorded more than half a century ago, in – according to guitarist Tony Iommi – a single day in 1969.