Following Cartesian quadrants:

Q1: Sunn O)))

Q2: Electric Wizard

Q3: Nine Inch Nails, specifically The Fragile

Q4: Porcupine Tree - Signify

Extra credit:

Left side: King Gizzard, The Crazy World of Arthur Brown

Right side: Delicate Steve, Lemon Jelly, The Orb - The Dream

Top: I’m kinda at a loss here, I can’t think of a band that makes you want to kill but has songs that both do and don’t go hard.

Bottom: Steven Wilson