AC/DC front man Brian Johnson on guitarist Malcolm Young's dementia

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AC/DC is in its fifth decade and still plans to go ahead with a world tour next year. However, earlier this year guitarist Malcolm Young was diagnosed with dementia, and more recently drummer Phil Rudd got into all sorts of trouble and is still facing drugs charges and allegations that he threatened to kill someone. Despite that, the band's seventeenth album "Rock or Bust" is released next week. Reporter Tom Bateman caught up with AC/DC front man Brian Johnson.