As the lights dim and curtains open, one of the most famous and iconic stage props of all time gradually descends from the ceiling. Above the audience’s din comes the tolling of a huge bronze bell, clouted by a man wearing a flat cap.Slowly and precisely, the musicians lurch into the concert’s opening song. "I got my bell, I’m gonna take you to Hell," squeals the singer animatedly, "I’m gonna get ya! Satan get ya."As rock theatre goes, what we’re witnessing is pure, unforgettable genius. Indeed, the only way AC/DC could follow it with their next album was with a 21-gun cannon salute.Weighing just over a ton, the band’s now legendary bell was manufactured in the UK for 1980’s world tour to promote Back In Black, their debut with new singer Brian Johnson. The idea of using it to preface the album and their shows came while working with producer ‘Mutt’ Lan