Ironbird
Kahler Abuser
Slayer in general, Jeff Hanneman (RIP) in particular. Here's a list of really good songs with some outstanding Hanneman riffs in them:
The Antichrist
Die By The Sword
Black Magic
Crionics
At Dawn They Sleep
Angel of Death
Raining Blood
South Of Heaven
Spill The Blood
War Ensemble
Dead Skin Mask
Seasons In The Abyss
Gary Holt comes a distant second for me, but we're talking about the Big 4 here, so it's all Jeff, Jeff, Jeff.
The Antichrist
Die By The Sword
Black Magic
Crionics
At Dawn They Sleep
Angel of Death
Raining Blood
South Of Heaven
Spill The Blood
War Ensemble
Dead Skin Mask
Seasons In The Abyss
Gary Holt comes a distant second for me, but we're talking about the Big 4 here, so it's all Jeff, Jeff, Jeff.