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I don't think I've ever experienced music or any other sonic event to have traveled up so many rungs of my spinal column and to have stayed there for so long. When they passed out the earplugs, it wasn't a joke.
But the music itself was audacious from the first chord of the specially tuned guitars with brief moments of melody moving through the can't-stress-it-enough loudness.
(If you'd like to read a nice review and explanation of "Hallucination City", check out http://wishiwerethere.typepad.com/pgwp/ )