ASTONISHINGFew bands could have conceived of, let alone pulled off, the exercise in excess that Dream Theater have with The Astonishing. In a vast catalog that includes several album length conceptual statements Metropolis, Pt. 2: Scenes from a Memory, Six Degrees of Inner Turbulence this is so extreme that it pushes at what their fans (a fanatical lot) may accept. Guitarist John Petrucci has written a double disc sci fi rock opera, set in a dystopian future in