Recording engineer and record producer Mike Exeter talks to Christina Rowatt about working with longtime studio collaborator Black Sabbath legend Tony Iommi, engineering on the final Black Sabbath record with producer Rick Rubin, recording some of rock's most magnificent voices including Judas Priest singer Rob Halford and the iconic Ronnie James Dio, making Judas Priest's 2018 album alongside Andy Sneap and his intuitive approach to make any artist feel comfortable enough in the studio to give their best performance.