circle takes the square is screamo (the real kind), not sure about the other one
LINKS TO GRINDCORE:
The red chord :
http://www.hxcmp3.com/bands/3832/ : they are grind enough for me
Terminally your aborted ghost :
http://www.hxcmp3.com/bands/377/ : they are good
Pig destroyer :
http://www.hxcmp3.com/bands/3427/