There is a lot of debate as to which metal song has the best breakdown. i've seen all the lists and as far as i can tell, "Domination" by Pantera seems to be the top pick. While i agree it's a pretty heavy breakdown, i don't believe t's the heaviest or most evil sounding. That honour goes to a group named As Blood Runs Black. The song, "In Dying Days". The breakdown starts at 1:48 if you just wanna skip to it. Enjoy.