Well, I don't listen to songs but to entire albums, anyway here's my list :
-Anything Meshuggah, mostly older stufs like Destroy Erase Improve, Nothing and Chaosphere.
-Opeth - Ghost Reveries (mind blowing extreme prog :twisted: )
-Ephel Duath - Pain Necessary to Know (Extreme Jazz)
-Cryptopsy - Once Was Not (grinding death to the core :twisted: )
-Trivium - Ember To Inferno (not bad, reminds me of what I was listening 10 years ago)