>>127632450
absolutely false
metallica was influential in cementing the thrash metal sound but heavy metal is much older than thrash
the first heavy metal band black sabbath, created the metal sound with their specific riffing sound combined with distorted guitar and darker lyrics.
their heavier slower darker songs like title track on self titled and electric funeral directly created the doom metal subgenre (which further evolved with pentagram)
after black sabbath, bands like motorhead and judas priest also appeared and cemented the metal sound even more, causing a movement called "new wave of british heavy metal" in the early 1980's, with bands like iron maiden coming out of it, as well as other great bands like exciter, angel witch, satan and diamond head.
the nwobhm scene basically spawned speed metal, which was nwobhm played at a much faster speed, like for example exciter's first album, out of speed metal genres like us power metal and blackened speed (venom) appeared, as well as around the mid 1980's genres like thrash
