Roger Waters does not muck about.  In the process of creating a rock show he simultaneously pulls off a feat of engineering and artistry right at a central historical crossroads.  Potsdamer Platz was part of no-man's land between East and West Berlin, and had to be excavated to house the enormous show.  In the course of excavations munitions were dug up, and also the bunker where Hitler met his final end.  The appropriateness of the spot, and its time in history, can only be matched by the array of artists who contribute to the show; the notoriously prickly Van Morrison and Sinead O'Conner amongst them.  Roger Waters looks quite casual, but is undoubtably in extreme focus as he orchestrates a parade of musicians offering some of their finest work, Cyndi Lauper with a cracking rendition of "Another Brick in the Wall", and Bryan Adams does a great duet with Waters on "Empty Spaces" before shredding "Young Lust."  Bringing together such a variety of performers, including a shoddy Russian marching band, Tim Curry, and Albert Finney bespeak the technical brilliance of one of the world's premier musicians.