Metallica's original line-up featured James Hetfield (guitar/vocals), Lars Ulrich (drums), Ron McGovney (bass), and Dave Mustaine (lead guitar). Because of tensions with Mustaine, McGovney left the band. Castro Valley-born bassist Cliff Burton was recruited as his replacement. Mustaine was fired in April 1983 for his drug and alcohol problems, overly aggressive behavior and clashes with bandmates.
Despite their differences, Mustaine's contributions to early Metallica were still acknowledged; he received credits on four of the songs on Kill 'Em All. The songs "The Four Horsemen" (originally titled "The Mechanix"), "Jump in the Fire", "Phantom Lord" and "Metal Militia" were written by Mustaine, most of "The Four Horsemen" was written by Dave Mustaine when he was in his band Panic."The Mechanix" was...