American Express Co. is introducing a U.S. version of its "blue" card today and plans to celebrate its debut with a free rock concert in Manhattan's Central Park on Sept. 14.

The card was launched in 1997 in London and Taiwan as a product that would appeal to young people, and has since spread to eight other countries. The U.S. version will be somewhat different from the others, said Amex spokeswoman Gail Wasserman. She described the product as a "lifestyle card" that is not aimed at a particular generation.

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