GuD

I'm sure there was some pretentious artfart who utilized screaming as the primary vocal element of a song at least as early as the 1900s. Obviously you also have blues- someone mentioned Little Richard, also could throw in Howlin Wolf; Early Heavy Metal (which was basically louder Blues) in the lates 60s/early 70s to today. But, since this is the Hardcore section I'm gonna assume the first Hardcore screamer is what you meant.

They're not even a hardcore band really but The Screamers started in 75 and this one (recorded in 78 I think) is probably their best known song:



Then there's the obvious, Rites of Spring who started in 84:



And, while they're not screaming throughout the song there's The Sonics who recorded this in 58:



Supposedly they were a lot more "screamy" live but their mixer guy wasn't haven't it while in the studio.

Edit: This thread is from 2008?!