probably Blue Cheer, Black Sabbath.
Helter Skelter is great, but not metal. To me its more like punk.
First Speed metal sound i know of is Goblin's E Suono Rock, 1977.
Goblin soundtracked a ton of horror films including the original Dawn of the Dead, Suspiria and Deep Red.
It's not a speed metal song per se, but they break into it around 2 minutes in-
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