Frownland

Dream Theater's Six Degrees of Inner Turbulence, most any album by Tool, but I'd say that Aenima is their definitive piece, and Opeth's Deliverance seem to be prime staples of the progressive metal genre. Porcupine Tree gets a lot of props for what they're doing, but they rarely bring in metal influence in their songs, and seem more like a somewhat heavier Pink Floyd most of the time.

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Studies show that when a given norm is changed in the face of the unchanging, the remaining contradictions will parallel the truth.