It's been a tumultuous year for veteran rock band ACDC - Last month their drummer Phil Rudd was charged with threatening to kill, while one of their founding members Malcolm Young has had to leave the band after being diagnosed with dementia. But for one of the biggest selling bands of all time the show must go on - and their fifteenth album has just been released. They spoke to our Arts & Entertainment Correspondent Lucy Cotter about life without Malcom.