Power Metal was the name given to a demo recorded sometime in April 1982. Although the demo was never officially released, it was given the bootleg name Power Metal after the tagline McGovney had printed on Metallica's first business cards. The tape contained four original songs, including two new songs, The Mechanix, written by Dave Mustaine, and Motorbreath, written by James Hetfield. It was also, like all previous demos, recorded in McGovney's garage.Personnel■ James Hetfield - lead vocals, rhythm guitar■ Lars Ulrich - drums■ Dave Mustaine - lead guitar, backing vocals■ Ron McGovney - bass guitar■ The Mechanix was the original version of The Four Horsemen which later appeared on Metallica's 1983 debut album Kill 'Em All. Mustaine also included a reworked version of the song, simply titled Mechanix, on the first Megadeth album, Killing Is My Business... and Business Is Good!.