It was recorded to mark the 30th anniversary of the record's release - a second clip will launch towards the end of the month. Shermann says: "With the overwhelming feedback from last year's Melissa 30-year anniversary video, it was obvious we were going to do the same with Don't Break The Oath.

"We think the fans like to see how it's really played by the original guitar players, so we tuned and tweaked the guitars and amps as we did back in 1984. This is as close as you'll get."

Meanwhile, Mercyful Fate frontman King Diamond is working on remastering some of the band's material for a compilation project. The singer said: "I don't like the versions which are out - I think they have been crushed to death and a lot of the original sounds have been squashed.