For its promoters, a River had to be seen as a route for cultural exchanges and Music as a vector for mutual respect.

UNESCO: Culture

But the puzzles of the libretto seem to interest Mr Wilson less than how the performers look and move, and Mr Glass writes music less to fit particular words or dramatic exchanges than to create mood and atmosphere.

ECONOMIST: Philip Glass: Not all ravens are white | The

The technology promises to morph Apple from the business of simply selling gadgets and music and movies that can be played on those devices into an intermediary in all kinds of exchanges.

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