definitely not avenged seven fold....... This is an impossible question to answer because noone can say that they have 1 hardest song for them. As far as the "technical metal" comments made earlier, I don't know what you mean by "technical". When I think of that I think progressive, and those bands are not progressive. Symphony X or Dream Theatre are progressive metal bands. A lot of Michael Romeos stuff is insane.

Dragonforce's stuff is WAY overproduced in the studio. They can't actually play that perfectly in real life.