Along with Roger Glover and John-Paul Jones, Terence ‘Geezer’ Butler represents the unholy trinity of 1970s British rock bass: unlike those esteemed players (of Deep Purple and Led Zeppelin respectively, like you didn't know that already), his band – the one and only Black Sabbath – can truly claim to have invented heavy metal, albeit inadvertently.
The HM tag – itself the obvious tag for a sound comprising Ozzy Osbourne's demented vocals, Tony lommi’s crushing, downtuned riffs and the rhythm section of Butler and drummer Bill Ward – later became ubiquitous, but Sabbath are acknowledged by pretty much everyone as the group who started it all off.
