Ummm I dun know if these are the best of all time, but they're the first ones that popped into my head.
Iron Man... simple but God I love it...
System Of A Down - B.Y.O.B. Obviously.
Last Resort... by Papa Roach. Not my favorite band in the world. But the riff is just OMG.
Disturbed. Down With The Sickness. Like it a lot.
There's more I know... but I'm half asleep at the moment so =\
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