Rhys Chatham, the man who rocks the minimalist canon like a hurricane, gathers up the City of Light in the evanescent beauty of his latest piece - written for 400 guitars and performed live in the basilica of landmark Sacre Coeur - with 10,000 people watching and 100,000 more on national TV. As the music shimmers, it offers a snapshot of eternity, an echo of a moment a thousand years gone - and a thousand years yet to come.