Well, this is proper brilliant – a Black Sabbath documentary heading to the big screen feels long overdue for a band that literally invented heavy metal in a Birmingham basement. Whether you've been headbanging to Sabbath since 1970 or discovered them through Ozzy's telly shenanigans, this should give you the full story of how four working-class lads accidentally changed music forever. If you're into heavy music at all, it's worth marking your calendar for October – there's something special about experiencing that kind of raw rock history on the cinema screen rather than your laptop.