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Scream - band - ended in 1990.
Scream - band - was created in 1981.
The Horrorpops kinda scream, they have the lead singer on an upright bass.
A few of their songs are, but I would not classify it as sceamo.
No theyre not a christian band. The lead singer was originally in a band called EatMeWhileImHot and it was a scream-o band. They just do pop/rock.