Flotsam and Jetsam immediately replaced Cliff after his death (Doughton, 73).
             Metallica's heavy roots are traced back to their 1983 debut album Kill 'Em All. This album is considered by most the very first thrash metal album ever. According to Alan Gilkeson from the website about.com, thrash metal is "...basically derived from the Hardcore Punk cross over of the late 70's and early 80's, this style was of course brought to notoriety by the one and only Metallica." The band's main early influences include Motorhead, Diamond Head, and Judas Priest (Crocker, 24). Taking these influences and mixing them with their own writing style, Metallica invented thrash metal. Although a new style of music was spawned from this album, it was not technically advanced. The music mainly consisted of a lot of double picking on the guitar and fast double bass drum beats (Doughton, 25-26). The lyrical content of Kill 'Em All is not particularly profound. There are several examples of this on the album. The track Seek and Destroy is basically about a group of peopl
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